Post by: Joseph41 on October 09, 2018, 03:25:11 pm
(https://i.imgur.com/QzfqSUN.png)
This thread is for all exam-related discussion. Was it easy? Was it hard? What did you get for each question? Feel free to post any and all of your thoughts below.
If you don't have an ATAR Notes account yet, no stress - you can register for free here!
Post by: Unsplash on November 05, 2018, 11:00:28 am
Post by: English101 on November 05, 2018, 11:53:00 am
Post by: crouchie on November 08, 2018, 04:08:20 pm
SECTION A - Multiple Choice questions
- C
- A
- D
- C
- A
- D
- B
- B
- C
- C
- C
- E
- E
- B
- E
- B
- C
- E
- C
- A
SECTION B
a.
b.
Post by: Joseph41 on November 08, 2018, 04:09:44 pm
Answers will be uploaded in this post when the exam is over.
Love it! Hope everyone is doing well as we speak. :)
Post by: addictwithatextbook on November 08, 2018, 05:42:48 pm
Post by: integrationbyrecognition on November 08, 2018, 05:45:52 pm
Post by: Synchronised123 on November 08, 2018, 05:46:09 pm
Post by: integrationbyrecognition on November 08, 2018, 05:48:27 pm
thought the exam was alot easier than last year's exam 2, although the situation and the pressure really propelled its difficulty higher than it really should have been for mealot easier than last years????
Post by: Synchronised123 on November 08, 2018, 05:50:06 pm
alot easier than last years????
Maybe the extended response parts but the M/C felt a bit weird and different to standard
Post by: Mischi on November 08, 2018, 05:51:24 pm
Post by: Lear on November 08, 2018, 05:52:19 pm
thought the exam was alot easier than last year's exam 2, although the situation and the pressure really propelled its difficulty higher than it really should have been for me
Agreed. Much, much more easier than last year.
Expect A+ to be above ~68/80
Post by: integrationbyrecognition on November 08, 2018, 05:54:13 pm
Post by: Freddie Hg on November 08, 2018, 05:54:26 pm
Hopefully my performance on this exam helps me out with my exam 1 score. can a high A in exam 1 and a A plus in exam 2 still pull a low 40??
rank 1, in a weak cohort
Post by: Siddharth Nichani on November 08, 2018, 05:56:10 pm
Post by: Mattjbr2 on November 08, 2018, 05:57:53 pm
thought the exam was alot easier than last year's exam 2, although the situation and the pressure really propelled its difficulty higher than it really should have been for me
I got 70/80 for last year's exam under exam conditions, whereas i don't think i can even break 60/80 for this exam...
I disagree with you all. Yesterday was much easier than today. Yesterday I'd most likely get A+, but today? Nope.
Post by: Mischi on November 08, 2018, 05:58:09 pm
exam 2 was way better than exam 1!!!
Hopefully my performance on this exam helps me out with my exam 1 score. can a high A in exam 1 and a A plus in exam 2 still pull a low 40??
rank 1, in a weak cohort
I hope so, I'm in the same position
Post by: TheBamboozler on November 08, 2018, 06:00:06 pm
I'm actually feeling happy and not stressed for once.
I'm not going to look at the solutions this time. Ignorance is bliss my boys. Hope you all did good!
Post by: MathMethodsGuru on November 08, 2018, 06:01:59 pm
Post by: Freddie Hg on November 08, 2018, 06:02:41 pm
Post by: Freddie Hg on November 08, 2018, 06:03:51 pm
I got 70/80 for last year's exam under exam conditions, whereas i don't think i can even break 60/80 for this exam...Are you the inverse of a normal person??
I disagree with you all. Yesterday was much easier than today. Yesterday I'd most likely get A+, but today? Nope.
Post by: technodisney on November 08, 2018, 06:04:23 pm
I had extra time so everyone was already out and discussing the exam before I was finished. I walked up to a group of students talking to my methods teacher. She asked how I went, I had a massive smile on my face and said “crap”. Made them all laugh which I then took to mean everyone else did well... crap.
Ended up leaving out quite a bit, not because I ran out of time. But because I had no clue what to do.
Contrary to everyone elses opinions I found yesterday’s much easier than today’s.
Post by: DinWell on November 08, 2018, 06:05:48 pm
Are you the inverse of a normal person??That's so punny.
Post by: Freddie Hg on November 08, 2018, 06:06:56 pm
That's so punny.Hey Dinwell, did you Dowell?
Post by: Seno72 on November 08, 2018, 06:11:06 pm
Post by: AlphaZero on November 08, 2018, 06:11:37 pm
The TWM solutions will be up soon as well :)
Post by: DinWell on November 08, 2018, 06:11:43 pm
Hey Dinwell, did you Dowell?No, but NOTHING REALLY MATTERS anyway.
Post by: Seno72 on November 08, 2018, 06:13:33 pm
exam 2 was way better than exam 1!!!
Hopefully my performance on this exam helps me out with my exam 1 score. can a high A in exam 1 and a A plus in exam 2 still pull a low 40??
rank 1, in a weak cohort
You have a chance I believe. But last year, in the weak cohort for methods in my school, nobody got over 40. There were 5 39s.
Post by: Purple_Mango on November 08, 2018, 06:22:14 pm
Also, how did anyone approach that sampling question? The one where you had to find the least value of n. (It's kind of cheesy that they had named population as adults from Mathsville and Statsville, or whatever they're called)
But that last page, woaAAHH, I grabbed answers out of no where. (What was the area between inverse of g, x-axis and that other line? I got 1 square unit, wtf)
Post by: MathMethodsGuru on November 08, 2018, 06:24:39 pm
Compared to yesterday's exam - yes, SO much more doable. Probably landed at least 10% higher than it too. Kind of surprised that there wasn't a question like the Ferris Wheel one from last year - but that's fortunate.
Also, how did anyone approach that sampling question? The one where you had to find the least value of n. (It's kind of cheesy that they had named population as adults from Mathsville and Statsville, or whatever they're called)
But that last page, woaAAHH, I grabbed answers out of no where. (What was the area between inverse of g, x-axis and that other line? I got 1 square unit, wtf)
Yes. the ferris wheel. Stunned that such a question was omitted. A trig question like that where you need to find the range, period, max, min, average rate of change, angle, time when max occurs (no feature!)
Post by: Lear on November 08, 2018, 06:25:02 pm
Post by: undefined on November 08, 2018, 06:26:57 pm
Compared to yesterday's exam - yes, SO much more doable. Probably landed at least 10% higher than it too. Kind of surprised that there wasn't a question like the Ferris Wheel one from last year - but that's fortunate.I also got 1 square unit lol fairly certain it's wrong though
Also, how did anyone approach that sampling question? The one where you had to find the least value of n. (It's kind of cheesy that they had named population as adults from Mathsville and Statsville, or whatever they're called)
But that last page, woaAAHH, I grabbed answers out of no where. (What was the area between inverse of g, x-axis and that other line? I got 1 square unit, wtf)
Post by: Freddie Hg on November 08, 2018, 06:28:56 pm
No, but NOTHING REALLY MATTERS anyway.:( sorry to hear that, good luck for everything else.
always remember nothing is harder then exam 1 2018 methods!!
Post by: Dais_Deorum on November 08, 2018, 06:30:52 pm
Post by: Freddie Hg on November 08, 2018, 06:32:05 pm
p> 1/n. P=x/n. Therefore x>1what question is this??
Post by: Lear on November 08, 2018, 06:33:43 pm
what question is this??
uhh someone asked how to do the P hat question but deleted it...
Post by: Synchronised123 on November 08, 2018, 06:34:27 pm
what question is this??
what question is this??
The question about statsville and mathsville, where you had to find the probability the proportion of those having a low BPM was greater than 0.99
Post by: crawlingvines on November 08, 2018, 06:34:53 pm
What was the area between inverse of g, x-axis and that other line? I got 1 square unit, wtf
I got 1/8 :o
Edit: Just realised you were asking about the last page instead of the second last - ignore me!
Post by: S200 on November 08, 2018, 06:35:09 pm
Anyone got a copy of the exam?Check forum copyright rules on the exam 1 thread.
All I can say about the exam is this...
AAAARGH!
Post by: Freddie Hg on November 08, 2018, 06:35:32 pm
uhh someone asked how to do the P hat question but deleted it...damn then i didnt get that? are you talking about the smallest number of n, for p hat to be greater than 0.99
Post by: DinWell on November 08, 2018, 06:36:05 pm
I got 1/8 :oI got 1/8 for the area between the two functions (not the very last question), but not for that question.
Post by: G-Fr3sh on November 08, 2018, 06:36:34 pm
Post by: fluff on November 08, 2018, 06:41:14 pm
That wasn’t easy but I feel like it was so much better than last years!
Did anyone else get 41 for the number of trials and what did people get for the very last question?
Post by: DinWell on November 08, 2018, 06:42:20 pm
Has everyone sat the exam? Or are there still people doing it at a later date?Everyone has to sit it at the same time. Otherwise there would be risk of cheating.
That wasn’t easy but I feel like it was so much better than last years!
Did anyone else get 41 for the number of trials and what did people get for the very last question?
Post by: Freddie Hg on November 08, 2018, 06:44:35 pm
if you cant remember your answer, what was your theory behind it?
Post by: undefined on November 08, 2018, 06:46:23 pm
Has everyone sat the exam? Or are there still people doing it at a later date?I got 39
That wasn’t easy but I feel like it was so much better than last years!
Did anyone else get 41 for the number of trials and what did people get for the very last question?
Post by: vox nihili on November 08, 2018, 06:47:20 pm
Please play by the rules on this and we'll have a good night discussing the exam!
Congratulations to you all for finishing up Methods. It's a bloody hard subject that will pay dividends as you progress onto further study next year and beyond.
Post by: DinWell on November 08, 2018, 06:47:37 pm
I got 39Same. I think you had to make Pr(X>1) > .99 so 1-Pr(X=0)-Pr(X=1)>.99. Then solve for n
Post by: Dais_Deorum on November 08, 2018, 06:48:08 pm
Post by: Lear on November 08, 2018, 06:50:50 pm
Thoughts on A+ cutoff?
Between 66-69/80
Post by: Freddie Hg on November 08, 2018, 06:51:36 pm
Same. I think you had to make Pr(X>1) > .99 so 1-Pr(X=0)-Pr(X=1)>.99. Then solve for ni did exactly this? but didnt get 39?i got somewhere near high 20s i cant remember exactly what
Post by: DinWell on November 08, 2018, 06:53:22 pm
i did exactly this? but didnt get 39?i got somewhere near high 20s i cant remember exactly whatHmm. Did you end up solving
Post by: DoingExamsATM on November 08, 2018, 06:54:09 pm
damn then i didnt get that? are you talking about the smallest number of n, for p hat to be greater than 0.99
Just gonna drop in, for that question I got n = 39 or something. I'm confident with the answer but I'm not sure if I used a valid method, I created function(n)=binomialcdf(defined with n parameter as max and amount), then subbed in random values of n until it's just above 0.99. This is basically the equivalent of putting it onto a spreadsheet and observing for the value of n.
Post by: Lear on November 08, 2018, 06:55:53 pm
i did exactly this? but didnt get 39?i got somewhere near high 20s i cant remember exactly what
You got 27 because you did x>=1 instead of x>1.
Post by: integrationbyrecognition on November 08, 2018, 06:57:02 pm
Post by: Freddie Hg on November 08, 2018, 06:57:34 pm
You got 27 because you did x>=1 instead of x>1.but i did pr(x=0) plus pr(x=1)? thats odd you guys are right probably a calculating error on my behalf
Post by: DinWell on November 08, 2018, 06:58:41 pm
Just gonna drop in, for that question I got n = 39 or something. I'm confident with the answer but I'm not sure if I used a valid method, I created function(n)=binomialcdf(defined with n parameter as max and amount), then subbed in random values of n until it's just above 0.99. This is basically the equivalent of putting it onto a spreadsheet and observing for the value of n.How did you write it out on the exam? Did you use calculator notation?
Post by: Dais_Deorum on November 08, 2018, 06:59:35 pm
Between 66-69/80
Tbh think thats an overestimation. The highest cutoff in the last 7 years was 67-68, and tbh our's wasn't the easiest in that time frame. I'm calling 66, but will have to wait and see!
Post by: ThomasBur on November 08, 2018, 07:01:19 pm
Post by: crawlingvines on November 08, 2018, 07:03:06 pm
lol why am I the only one who found today's exam harder than last years :-X
I'm in the same boat as you D:
Post by: Freddie Hg on November 08, 2018, 07:03:59 pm
Does anyone recall what the probability was for the 'find value of n' question?its 39. just checked my calculator, its definitely 39
Post by: userrrname on November 08, 2018, 07:07:50 pm
Post by: DoingExamsATM on November 08, 2018, 07:09:11 pm
How did you write it out on the exam? Did you use calculator notation?
I written something like "this is equal to binomial cdf with lower = 1, upper = n, number trials = n, probability = [whatever it was]". Not quite calculator notation, but in a way that's like "it's pretty obvious this is just using some kind of calculator function with these values". As far as I know, that's allowed, since it's not like I written "binomcdf(n,thing,thing)".
The issue is that I also written "trial and error: insert n = [value], then pr = 0.6 which is <0.99", then a couple more lines to show I got to n = 39 being just above 0.99
Post by: Edged on November 08, 2018, 07:10:10 pm
Post by: DinWell on November 08, 2018, 07:14:26 pm
What did people get for the distance PQ?I got around 1.910. Was it 3 d.p.?
Post by: undefined on November 08, 2018, 07:14:31 pm
What did people get for the distance PQ?1.91m but other people got 1.90 so I'm not sure
Edit: 1.90835472m
Post by: Dais_Deorum on November 08, 2018, 07:17:27 pm
Post by: integrationbyrecognition on November 08, 2018, 07:18:37 pm
Post by: DinWell on November 08, 2018, 07:19:01 pm
What about the values of a for which f(x) had no solutions? (Last part of question 1)I got a>root(14)+3
Post by: Dais_Deorum on November 08, 2018, 07:19:50 pm
I got a>root(14)+3
Yep same
Post by: Nason on November 08, 2018, 07:20:06 pm
I also got 1 square unit lol fairly certain it's wrong thoughI'm seeing a lot of people get 1 squared unit for that one, including myself. for the area between g(x) and its inverse I got 1/4 however.
Post by: Freddie Hg on November 08, 2018, 07:20:22 pm
1.91m but other people got 1.90 so I'm not sureyeah i got 1.91
Edit: 1.90835472m
Post by: Freddie Hg on November 08, 2018, 07:21:16 pm
I got a>root(14)+3i got this with another answer,
Post by: Nason on November 08, 2018, 07:23:49 pm
i got this with another answer,Pretty sure the other answer was a<3-sqrt(14) or something.
I did the same but I just realized it's wrong as a>0
Post by: DinWell on November 08, 2018, 07:24:31 pm
i got this with another answer,Did you also say a<3-root(14)? I think you had to exclude that because p(x) has more than 1 turning point with those values.
Post by: Freddie Hg on November 08, 2018, 07:24:52 pm
Pretty sure the other answer was a<3-sqrt(14) or somethingyeah :)
Post by: Lear on November 08, 2018, 07:25:25 pm
Post by: DoingExamsATM on November 08, 2018, 07:26:34 pm
Anyone manage to figure out question 20 of MC?
What was the question again? I initially struggled with multiple choice 17-20, but managed to struggle through it and get answers I'm very confident in
Post by: DinWell on November 08, 2018, 07:26:58 pm
Pretty sure the other answer was a<3-sqrt(14) or something.
I did the same but I just realized it's wrong as a>0
Didn't it say that a was any real number? I thought it a>1 since that's the condition if we want just 1 turning point.
Post by: Nason on November 08, 2018, 07:27:49 pm
Didn't it say that a was any real number? I thought it a>1 since that's the condition if we want just 1 turning point.
Ooooh maybe, but I think having a<0 would reflect the entire graph causing there to be more than one intersection right? not sure
Post by: integrationbyrecognition on November 08, 2018, 07:28:14 pm
How are people saying yesterdays was harder??????? Did we get different exams???? With the exception of the last question yesterday, today’s one was ten times harder.I reckon today's exam 2 was harder than any of the previous years methods exam 2's
Post by: integrationbyrecognition on November 08, 2018, 07:29:58 pm
but i then used this value in the next question and got P as (~53.9, ~4.9). Am I likely to get any consequential marks here?
Post by: G-Fr3sh on November 08, 2018, 07:30:39 pm
1.91m but other people got 1.90 so I'm not sure
Edit: 1.90835472m
I got 1.51
Post by: Lear on November 08, 2018, 07:31:29 pm
Didn't it say that a was any real number? I thought it a>1 since that's the condition if we want just 1 turning point.
yeah a>1 was a condition as the question asked 'if there is only one turning point, find a such that....'
So a was implicitly more than 1.
Post by: DinWell on November 08, 2018, 07:32:10 pm
Ooooh maybe, but I think having a<0 would reflect the entire graph causing there to be more than one intersection right? not sure
Yeah a cant be negative if there's one intersection but also it can't be between 0 and 1.
Post by: Nason on November 08, 2018, 07:33:55 pm
Yeah a cant be negative if there's one intersection but also it can't be between 0 and 1.
Yeah that's one mark lost for me. Should have known there wouldn't be two ranges given the previous questions. Surprised I got the answer though as no one else in my cohort did
Post by: AlphaZero on November 08, 2018, 07:36:09 pm
Anyone manage to figure out question 20 of MC?
I'm working on solutions right now. I just finished worked solutions for Section A :)
Post by: Chloe.lee2001 on November 08, 2018, 07:36:28 pm
Post by: Freddie Hg on November 08, 2018, 07:36:38 pm
]
Yeah a cant be negative if there's one intersection but also it can't be between 0 and 1.
blasts!!!
Post by: AlphaZero on November 08, 2018, 07:37:20 pm
When will the full solutions be up? Should’ve written down what I got for the mc but ran out of time even to finish the exam :(
I'm working on them as fast as I can! I should get them up in the next 2 hours :)
Post by: Chloe.lee2001 on November 08, 2018, 07:39:34 pm
I'm working on them as fast as I can! I should get them up in the next 2 hours :)
Sounds great thankyou :D
Post by: integrationbyrecognition on November 08, 2018, 07:41:08 pm
I'm working on them as fast as I can! I should get them up in the next 2 hours :)Did you think this exam was harder than the last couple of years?
Post by: BBBBBBB on November 08, 2018, 08:07:35 pm
Finished at the 50th percentile for Units 3 and 4
First Exam- 22/40
2nd exam- 50/80
Thanks in advance
Post by: addictwithatextbook on November 08, 2018, 08:08:06 pm
And for the three-mark question finding distance PQ, was there any other method that was less time-consuming than finding the coordinates of Q than using the distance formula? The distance formula felt like it has been used so much in these two exams.
Post by: Nason on November 08, 2018, 08:10:43 pm
How did you guys get 1/8 for the question (on the second last page I think?) finding area? I got a different answer although 1/8 was one of the answers I got using a method.Do you mean for the area of inverse of g and the x=(whatever) line? Or the bounded area between g and its inverse? For the first one I got 1, for the second one I got 1/4
And for the three-mark question finding distance PQ, was there any other method that was less time-consuming than finding the coordinates of Q than using the distance formula? The distance formula felt like it has been used so much in these two exams.
Post by: petersenge on November 08, 2018, 08:11:08 pm
Hi was wondering if someone could predict my study score31-34 depending on distribution this year, cohort strength etc
Finished at the 50th percentile for Units 3 and 4
First Exam- 22/40
2nd exam- 50/80
Thanks in advance
Post by: tinkerbell101 on November 08, 2018, 08:13:09 pm
Anyone manage to figure out question 20 of MC?
i remember getting a but i'm not sure if its correct
Post by: AlphaZero on November 08, 2018, 08:13:50 pm
Solutions by Daniel Traicos at TWM Publications
Interesting exam! Definitely some difficult ones!
Edit 1: Fixed a typo in Q18 MCQ. Added marking allocation.
Edit 2: Fixed the solution to Q3f (answer is 1.91 m).
Post by: Jemin99 on November 08, 2018, 08:20:39 pm
Post by: addictwithatextbook on November 08, 2018, 08:20:50 pm
Do you mean for the area of inverse of g and the x=(whatever) line? Or the bounded area between g and its inverse? For the first one I got 1, for the second one I got 1/4
Neither, I think. It was the bounded area between two functions... f(x) and h(x)? h(x) was a straight line I think
Post by: Lear on November 08, 2018, 08:21:48 pm
VCAA 2018 Methods Exam 2 SECTION A Provisional Solutions
Solutions by Daniel Traicos at TWM Publications
Have had lots of requests for this. I'm still working on Section B. Please be patient :)
These are great. Thank you.
Post by: Nason on November 08, 2018, 08:23:55 pm
Neither, I think. It was the bounded area between two functions... f(x) and h(x)? h(x) was a straight line I think
ahhh yeah I think I got 1/8 for that one too. The two areas were both 1/16 I'm pretty sure
Post by: DinWell on November 08, 2018, 08:25:27 pm
VCAA 2018 Methods Exam 2 SECTION A Provisional SolutionsBrilliant, thanks!
Solutions by Daniel Traicos at TWM Publications
Have had lots of requests for this. I'm still working on Section B. Please be patient :)
Post by: addictwithatextbook on November 08, 2018, 08:28:33 pm
ahhh yeah I think I got 1/8 for that one too. The two areas were both 1/16 I'm pretty sure
Oh, darn. I got 3/16 randomly then which is unfortunate. I didn't think that the two area would be equal ;D
Also, thanks for the solutions!
Post by: jpulvirenti on November 08, 2018, 08:34:41 pm
Exam 1: 34/40
exam 2 between 60 and 65 out of 80
Post by: billy606 on November 08, 2018, 08:36:08 pm
That was tough. It felt a lot easier than Exam 1, but still hard for me. Might be the pressure talking, but I thought that was harder overall than previous years (probably because I ran out of time and missed out on 4 precious marks), although the difficulty may have been similar The style of questions, especially most of multiple-choice, felt unconventional. Also lots of asking for decimals? (did anyone get 39 for the smallest value of n in the probability q because I just trial+errored a method i wasn't sure of)i got 39 also
Post by: popcorndudette on November 08, 2018, 08:37:11 pm
Exam 1: 37-39/40
Exam 2: 75/80
Also, will I be penalised if I didnt simplify root(1/x) to 1/root(x) in exam 1?
Post by: integrationbyrecognition on November 08, 2018, 08:42:46 pm
Could someone predict study scorehigh 30s,
Exam 1: 34/40
exam 2 between 60 and 65 out of 80
Post by: ajs13 on November 08, 2018, 08:45:44 pm
Exam 1 - 16/40
Exam 2 - 38/40
Post by: Freddie Hg on November 08, 2018, 08:46:51 pm
high 30s,exam 1 score is good?! and exam 2 is not bad i think low 40s
Post by: integrationbyrecognition on November 08, 2018, 08:48:05 pm
is there any chance of a raw 25 with these scores or is it all gone now?You might be able to get 29-30 raw (assuming you meant 38/80 for exam 2)
Exam 1 - 16/40
Exam 2 - 38/40
Post by: ajs13 on November 08, 2018, 08:50:41 pm
You might be able to get 29-30 raw (assuming you meant 38/80 for exam 2)
wow that would be incredible if accurate, and yeah I meant 38/80 for exam 2
Post by: ganshenme on November 08, 2018, 08:54:25 pm
Exam 1: 38/40
Exam 2: somewhere between 65 and 70/80
Thanks so much and good job for finishing methods guys :)))
Post by: integrationbyrecognition on November 08, 2018, 08:55:41 pm
wow that would be incredible if accurate, and yeah I meant 38/80 for exam 2don't quote me on that haha, it's just a prediction
ganshenme, you're looking at around low 40s raw
Post by: marauder52 on November 08, 2018, 08:57:27 pm
Rank 10-20 Strong cohort with 90% average.
exam 1: 29/40
Exam 2: 70-75/80
Shot at 40?
Post by: Nason on November 08, 2018, 09:01:17 pm
Exam 1: 34-36/40
Exam 2: 70-75/80
With rank 1 in a decent cohort
Post by: LOL_ABC on November 08, 2018, 09:01:26 pm
Post by: integrationbyrecognition on November 08, 2018, 09:01:45 pm
Odd prediction, I know.~40-42 raw
Rank 10-20 Strong cohort with 90% average.
exam 1: 29/40
Exam 2: 70-75/80
Shot at 40?
Post by: integrationbyrecognition on November 08, 2018, 09:02:49 pm
How am I looking for a 40?~40-45 raw
Exam 1: 34-36/40
Exam 2: 70-75/80
With rank 1 in a decent cohort
Post by: integrationbyrecognition on November 08, 2018, 09:03:43 pm
Guys predict SS sacs 80% Exam 1: 30 ish and exam 2 60ish37 raw assuming you mean 30/40 and 60/80
Post by: Freddie Hg on November 08, 2018, 09:09:48 pm
rank 1 decent if not weak cohort
Post by: DinWell on November 08, 2018, 09:11:11 pm
Post by: Freddie Hg on November 08, 2018, 09:12:03 pm
Aren't these prediction posts more relevant in the study score prediction thread?haahahah im too afraid to go there with my exam 1 score
Post by: jondempsey17 on November 08, 2018, 09:14:15 pm
Post by: vox nihili on November 08, 2018, 09:16:34 pm
Aren't these prediction posts more relevant in the study score prediction thread?
Yes. Please everyone stop posting your scores here. It's for the study score prediction thread, this is for discussing the exam and I'm concerned that the incessant chatter about scores is driving people away from the discussion.
Post by: petersenge on November 08, 2018, 09:16:50 pm
If i averaged around 64% for SACs (Hard SACs) and got 28-30 out of 40 for Exam 1 and around 50-60 for exam 2, what study scores would i be looking at (hopefully between 22-28)22-28? 30/40 and a 60/80 will easily net a 35-37
Post by: jondempsey17 on November 08, 2018, 09:18:12 pm
Post by: Azzzz on November 08, 2018, 09:19:49 pm
But isnt exam 2 out of 120??No, exam 2 is out of 80.
In total, both exams add up to 120.
Post by: integrationbyrecognition on November 08, 2018, 09:20:36 pm
I made an account just to vent and create an outlet for my mental anguish post-Methods :(You would get around a 29 raw, and yes, this exam's mcq questions were brutal
I need a study score of 25 or above for ALL the courses I want to do which I thought was going to be achievable until... today. I found exam 1 hard and am expecting ~15/40, found exam 2 more accessible but the difficulty of the MC questions messed up my positive mindset so I wouldn't be surprised if I bombed that as well. Might I add that I just found out my calc was in degrees THE WHOLE TIME? YEAH. Marks for the entire bridge question? Gone. I feel sick while typing this. I'm expecting ~40/80 at best.
Is there any hope for me to get a score of raw 25 or above? I'm currently ranked average in a very strong cohort (sucks to be dragging all my mates scores down but that's the price I have to pay for being forced to do a subject I detest as a prereq :-\). My school's SACs do get scaled up but I guess there's a slim chance of moderation saving my grades considering I bombed both exams.
I'm sorry for being so whiny in this post, it's just that I just have no one else to talk to about this because I'm so ashamed if I'm being quite frank.
Post by: Dais_Deorum on November 08, 2018, 09:21:27 pm
No, exam 2 is out of 80.
In total, both exams add up to 120.
Exam 1 is out of 40 and Exam 2 is out of 80. For each exam, two assessors marks it and add up their scores; thus it being out of 80 for p 1 and 120 for p 2
Post by: jondempsey17 on November 08, 2018, 09:21:45 pm
Post by: integrationbyrecognition on November 08, 2018, 09:22:27 pm
But isnt exam 2 out of 120??exam 2 is out of 120 (60 before doubling) in further, not methods
Post by: True Dat on November 08, 2018, 09:22:52 pm
Post by: DinWell on November 08, 2018, 09:25:01 pm
What study score do you think i would get if i got 25/40 for Exam 1 and 42/80 for exam 2You've gotta be kidding. Stop with the SS predictions. vox nihili literally just said to...
Post by: dream chaser on November 08, 2018, 09:26:27 pm
SACS: Averaged 74%
Exam 1: 25/40
Exam 2: 55/80
Post by: integrationbyrecognition on November 08, 2018, 09:26:46 pm
The multi choice was honestly a breeze up to about Q18, honestly you just needed good algebra skills to do well. I don't really get what people mean when they say it was unconventional questions. I would've thought maths was maths and it didn't have its own style o.0Not everyone is as smart as you then, and it's not good to boast if you found it easy
Post by: integrationbyrecognition on November 08, 2018, 09:27:26 pm
What Raw Study Score for Methods am I looking at?34 raw
SACS: Averaged 74%
Exam 1: 25/40
Exam 2: 55/80
Post by: crawlingvines on November 08, 2018, 09:27:52 pm
The multi choice was honestly a breeze up to about Q18, honestly you just needed good algebra skills to do well. I don't really get what people mean when they say it was unconventional questions. I would've thought maths was maths and it didn't have its own style o.0
Maybe tone down the pomposity a notch
Post by: Ace2018_03 on November 08, 2018, 09:28:41 pm
Exam 1: 36-37/40
Exam 2: 76/80
Post by: integrationbyrecognition on November 08, 2018, 09:30:26 pm
Could someone please predict:~45-46 raw
Exam 1: 36-37/40
Exam 2: 76/80
Post by: addictwithatextbook on November 08, 2018, 09:30:36 pm
The multi choice was honestly a breeze up to about Q18, honestly you just needed good algebra skills to do well. I don't really get what people mean when they say it was unconventional questions. I would've thought maths was maths and it didn't have its own style o.0
They felt, and probably were, quite different to the ones in previous years as a whole. They twisted some questions up like transformations, etc. Of course it's maths, though, but they have a style of questions and today it changed relatively significantly.
Post by: Lear on November 08, 2018, 09:33:53 pm
Not everyone is as smart as you then, and it's not good to boast if you found it easy
Given this thread is about discussing the exam i'd say it's perfectly fine to describe one's opinion on the difficulty of the exam. In my opinion the multiple choice was indeed pretty standard up till 18. You have your typical domain and range questions, tangent line questions, period questions, transformations, find integral for an area questions etc. Probability was notably weak on MC. I'd highly advise any future students to pay attention to questions that tend to reoccur. A lot of MC questions are pretty predictable if you do the questions from the last few VCAA exams.
Short answer was great too. Good mix of easy, difficult and challenging questions.
Post by: ihatemethods1234 on November 08, 2018, 09:36:43 pm
SAC average +/-74% (average of cohort is around 55%) average-strong cohort
Exam 1 - 25/40
Exam 2 - 61-65/80
Thanksyou!! :)
Post by: Guest1256 on November 08, 2018, 09:37:20 pm
Sacs 75% Rank 25/70 in a decent cohort in which sacs should scale up in all scenarios.
Exam 1 - 16/40 Exam 2 - 40/80
Exam 1 - 19/40 Exam 2 - 50/80
Exam 1 - 23/40 Exam 2 - 56/80
Thankyou very much
Post by: lilhoo on November 08, 2018, 09:38:47 pm
SACs: 92% (top 10) in an average-strong cohort
Exam 1: 30-35/40
Exam 2: 63-70/80
Thank you so much!
Post by: integrationbyrecognition on November 08, 2018, 09:39:22 pm
Given this thread is about discussing the exam i'd say it's perfectly fine to describe one's opinion on the difficulty of the exam. In my opinion the multiple choice was indeed pretty standard up till 18. You have your typical domain and range questions, tangent line questions, period questions, transformations, find integral for an area questions etc. Probability was notably weak on MC. I'd highly advise any future students to pay attention to questions that tend to reoccur. A lot of MC questions are pretty predictable if you do the questions from the last few VCAA exams.Can you please stop quoting my post for no reason? Honestly I made a fair point when i said that True Dat shouldn't boast if he found it easy when there would be others (including myself) who found this exam harder than usual. Also when you said that alot of the mc questions are predictable from past papers, this exam was alot harder, and i've done quite a few vcaa exam 2's and the mcq's were a lot more demanding and different to the past years vcaa exam 2's.
Short answer was great too. Good mix of easy, difficult and challenging questions.
I'm not trying to attack you, but please stop unnecessarily quoting my post and trying to force your opinion.
Thanks
Post by: Lear on November 08, 2018, 09:39:30 pm
Post by: lilhoo on November 08, 2018, 09:42:28 pm
Yep, perhaps thread should be renamed to study score prediction methods haha. These ain't stopping.
sorry about that hahaha i guess everyone is jusy anxious about their scores
Post by: vox nihili on November 08, 2018, 09:43:10 pm
This is a clear instruction not to post study score predictions in this thread. This thread is for exam discussion, not study score prediction. The cryptically titled "study score prediction thread" will serve that purpose.
You've been given the instruction twice now. Do not post study score predictions here.
Post by: petersenge on November 08, 2018, 09:43:41 pm
Post by: matthewmwps on November 08, 2018, 09:43:54 pm
Find the area between g^-1(x), the x axis, and x=2a/3?
Post by: Lear on November 08, 2018, 09:44:36 pm
sorry about that hahaha i guess everyone is jusy anxious about their scores
I completely understand :D. Here's the prediction thread for anyone else looking for a prediction - https://atarnotes.com/forum/index.php?topic=138501.msg1083493;topicseen#msg1083493
Post by: paranoidchair on November 08, 2018, 09:45:13 pm
Maybe the extended response parts but the M/C felt a bit weird and different to standard
I found the multiple choice super challenging but no one else that I talked to had a problem with it. I leave multi-choice till the end so I had to guess some of the answers because I was running out of time
Post by: integrationbyrecognition on November 08, 2018, 09:46:47 pm
I found the multiple choice super challenging but no one else that I talked to had a problem with it. I leave multi-choice till the end so I had to guess some of the answers because I was running out of timeMulti-choice was definitely harder than usual
Post by: Lear on November 08, 2018, 09:46:56 pm
Moving back on track, what did everyone do with the question of:
Find the area between g^-1(x), the x axis, and x=2a/3?
Was this the third last? I believe it was just 2 minus an integral. I got 1 square unit.
Post by: undefined on November 08, 2018, 09:48:51 pm
Was this the third last? I believe it was just 2 minus an integral. I got 1 square unit.Same. I plugged in random values of a and it kept spitting out 1 square unit so I was like this can't be right but at least it's not spitting out a negative area.
Post by: userrrname on November 08, 2018, 09:49:08 pm
Post by: JuuzouSuzuya on November 08, 2018, 09:53:08 pm
Guys, difficulty is subjective. People can think the exam is easy if they want, but there’s no need to make the rest of us feel like dumbasses. Sometimes I think people on atarnotes forget that there are ‘average’ students lol... And the thing is the majority of students fall under that category. Afterall only 9% of today’s test takers will get a 40+...
Post by: DinWell on November 08, 2018, 09:58:10 pm
Same. I plugged in random values of a and it kept spitting out 1 square unit so I was like this can't be right but at least it's not spitting out a negative area.Got 1 unit^2 aswell. I think it was 2-integral from 0 3/a of g(x)
Post by: vox nihili on November 08, 2018, 10:01:00 pm
Guys, difficulty is subjective. People can think the exam is easy if they want, but there’s no need to make the rest of us feel like dumbasses. Sometimes I think people on atarnotes forget that there are ‘average’ students lol... And the thing is the majority of students fall under that category. Afterall only 9% of today’s test takers will get a 40+...
I got absolutely destroyed by both methods exams, ended up with a 34 thanks to sweet sweet SAC scaling.
And in two years I'll be a doctor. *
One.exam.doesn't.change.your.life.
You'll be fine everyone.
*second humble brag, my mediocrity in methods didn't even stop me from landing in the top 10% of my Biomed cohort for maths. Seriously, one exam does not change your life.
Post by: Aaron on November 08, 2018, 10:02:49 pm
Guys, difficulty is subjective. People can think the exam is easy if they want, but there’s no need to make the rest of us feel like dumbasses. Sometimes I think people on atarnotes forget that there are ‘average’ students lol... And the thing is the majority of students fall under that category. Afterall only 9% of today’s test takers will get a 40+...
hear hear.
Post by: integrationbyrecognition on November 08, 2018, 10:05:09 pm
Post by: bmorvell on November 08, 2018, 10:16:58 pm
Post by: Lear on November 08, 2018, 10:21:29 pm
Just wondering if anyone had the extended response answers?Atarnotes user Dantraicos is writing them currently on behalf of TVM Publications and they will likely be uploaded either tonight or tomorrow :) You can find multiple choice answers on page 7 if you wish.
Post by: DinWell on November 08, 2018, 10:23:35 pm
Atarnotes user Dantraicos is writing them currently on behalf of TVM Publications and they will likely be uploaded either tonight or tomorrow :) You can find multiple choice answers on page 7 if you wish.Hey Lear. What did you get for the final question? Area between the inverse and g(x) I believe. Also, do you remember what you did for the final probability question? The one that asks for the probability a non year 12 is elite?
Post by: Daniel_24681 on November 08, 2018, 10:26:36 pm
Hey Lear. What did you get for the final question? Area between the inverse and g(x) I believe. Also, do you remember what you did for the final probability question? The one that asks for the probability a non year 12 is elite?
Just offering my 2 cents. The guys at my school had two separate interpretations, Pr(elite|non year 12) or Pr(elite intersection non year 12). So for the first one it was 0.0227 and the other interpretation was 0.019... We aren't sure which is correct though.
Post by: jazzycab on November 08, 2018, 10:28:36 pm
Below are my Extended Response answers
Section B Question 1
1a)
1b
1c
1d
1e
1f
1g
1h i
1h ii
1h iii
1b
1c
1d
1e
1f
1g
1h i
1h ii
1h iii
Section B Question 2
2a})
2b
2c
2d i(http://oi68.tinypic.com/2i06a93.jpg)
2d ii
2b
2c
2d i(http://oi68.tinypic.com/2i06a93.jpg)
2d ii
Section B Question 3
3a
3b
3c
3d
3e)
3f
3b
3c
3d
3e
3f
Section B Question 4
4a
4b i
4b ii\times\text{Pr}\left(S\right)\ne\text{Pr}\left(H\cap S\right)\Rightarrow H\text{ and }S\text{ are dependent})
4c i
4c ii
4c iii
4d i
4d ii\text{ is not contained within the Confidence Interval})
4e
4f
4g
4b i
4b ii
4c i
4c ii
4c iii
4d i
4d ii
4e
4f
4g
Section B Question 5
5a)
5b
5c
5d
5e
5f
5g
5b
5c
5d
5e
5f
5g
Post by: DinWell on November 08, 2018, 10:29:18 pm
Just offering my 2 cents. The guys at my school had two separate interpretations, Pr(elite|non year 12) or Pr(elite intersection non year 12). So for the first one it was 0.0227 and the other interpretation was 0.019... We aren't sure which is correct though.Thanks Daniel. I did the conditional one (I think?) but while I was doing it I was torn between the two.
Post by: vox nihili on November 08, 2018, 10:30:08 pm
My MCQ answers are the same as crouchie and Dantraicos.
Below are my Extended Response answersSection B Question 11a
1b
1c
1d
1e
1f
1g
1h i
1h ii
1h iii
Legend, good on you for sharing these!
Post by: ihatemethods1234 on November 08, 2018, 10:34:25 pm
Post by: DinWell on November 08, 2018, 10:35:55 pm
Did you intend to just quote yourself?LOL no idk why I did that. Removed it.
Post by: Sine on November 08, 2018, 10:36:02 pm
My MCQ answers are the same as crouchie and Dantraicos.a = 0 for 1f
Below are my Extended Response answersSection B Question 11a
1b
1c
1d
1e
1f
1g
1h i
1h ii
1h iii
otherwise it looks good!
was a=2 or a=0 for the last part of question 1 of short answer?a = 0 for 1f
Post by: Freddie Hg on November 08, 2018, 10:38:03 pm
I got absolutely destroyed by both methods exams, ended up with a 34 thanks to sweet sweet SAC scaling.hmmmm what you get in english?
And in two years I'll be a doctor. *
One.exam.doesn't.change.your.life.
You'll be fine everyone.
*second humble brag, my mediocrity in methods didn't even stop me from landing in the top 10% of my Biomed cohort for maths. Seriously, one exam does not change your life.
Post by: ihatemethods1234 on November 08, 2018, 10:38:47 pm
Post by: Lear on November 08, 2018, 10:39:33 pm
1g looks wrong as well?? my heart is racing right now please help?
1g seems correct to me.
Post by: integrationbyrecognition on November 08, 2018, 10:41:41 pm
a = 0 for 1fHey sine, did you think exam 1 and 2 this year was harder than usual?
otherwise it looks good!
a = 0 for 1f
Post by: ihatemethods1234 on November 08, 2018, 10:42:16 pm
1g seems correct to me.
Because wasnt that question supposed to be in terms of a?
Post by: matthewmwps on November 08, 2018, 10:43:28 pm
a = 0 for 1f
otherwise it looks good!
a = 0 for 1f
Actually if a=0, then stationary points exists for x=1,x=0, x=-2
because we now have x=1,-1- (1^1/2), -1 + (1^1/2) which become x=1,-1 - 1, -1 +1
Post by: vox nihili on November 08, 2018, 10:43:44 pm
hmmmm what you get in english?
Not going to derail the thread by making it the vox nihili show, PM if you want a chat.
1g looks wrong as well?? my heart is racing right now please help?
A reminder that randomly downvoting people's posts is against the forum rules because it's just that little bit petty and annoying.
Post by: Freddie Hg on November 08, 2018, 10:45:16 pm
1g looks wrong as well?? my heart is racing right now please help?1g looks fine.
Hey!! i can see by your username and your stressed out response to the solutions, that you are very apprehensive about your methods score. which you shouldn't be. its one exam one subject, you shouldn't get caught up in something that finished. instead of torturing yourself with more methods (which you hate) i recommend you finally celebrate. because you are free from what you hate. your lucky yknow, i hate english with a burning passion, more so than you with methods i can guarantee you that. but english unfortunately is by default in your top 4 where as methods can drop down to your bottom two. you should be happy for methods is over, forever. and that it can drop down to bottom two
Post by: MatthewGibney on November 08, 2018, 10:49:06 pm
Post by: matthewmwps on November 08, 2018, 10:50:20 pm
Guys how do you already know the answers when we haven't done the exam yet??Because we did it today? Are you sure you had the date right for your methods exam buddy?
Post by: AlphaZero on November 08, 2018, 10:50:31 pm
Post by: Aaron on November 08, 2018, 10:50:55 pm
Guys how do you already know the answers when we haven't done the exam yet??
rip
Post by: DinWell on November 08, 2018, 10:51:39 pm
Guys how do you already know the answers when we haven't done the exam yet??Great troll.
Post by: Sine on November 08, 2018, 10:52:55 pm
Hey sine, did you think exam 1 and 2 this year was harder than usual?I haven't done the exams fully yet so not the best person to deteremine the difficulty of the exams but from just looking over the exams and seeing what needs to be done to get to the answer I would think exam 1 was slightly tougher than usual and exam 2 looked to be normal difficulty (similar to 2014-2015).
Actually if a=0, then stationary points exists for x=1,x=0, x=-2not sure what you mean but
because we now have x=1,-1- (1^1/2), -1 + (1^1/2) which become x=1,-1 - 1, -1 +1
a only = 0 for 1f.
When you move onto the other questions a is any real number
Post by: DinWell on November 08, 2018, 10:55:51 pm
I haven't done the exams fully yet so not the best person to deteremine the difficulty of the exams but from just looking over the exams and seeing what needs to be done to get to the answer I would think exam 1 was slightly tougher than usual and exam 2 looked to be normal difficulty (similar to 2014-2015).Hey Sine. If 2014-2015 is considered normal difficulty. Where does 2016 and 2017 lie on the difficulty scale?
not sure what you mean but
a only = 0 for 1f.
When you move onto the other questions a is any real number
Post by: integrationbyrecognition on November 08, 2018, 10:57:20 pm
I haven't done the exams fully yet so not the best person to deteremine the difficulty of the exams but from just looking over the exams and seeing what needs to be done to get to the answer I would think exam 1 was slightly tougher than usual and exam 2 looked to be normal difficulty (similar to 2014-2015).Lol there's no way this was comparable to 2014-2015, 2014 and 2015 were dead easy, even 2016 and 2017 were reasonable, this years exam 1 and 2 were completely fucked
not sure what you mean but
a only = 0 for 1f.
When you move onto the other questions a is any real number
Post by: Dais_Deorum on November 08, 2018, 10:57:21 pm
My MCQ answers are the same as crouchie and Dantraicos.
Below are my Extended Response answersSection B Question 11a
1b
1c
1d
1e
1f
1g
1h i
1h ii
1h iiiSection B Question 22a
2b
2c
2d i(http://oi68.tinypic.com/2i06a93.jpg)
2d iiSection B Question 33a
3b
3c
3d
3e
3fSection B Question 44a
4b i
4b ii
4c i
4c ii
4c iii
4d i
4d ii
4e
4f
4g
Was 3C to the nearest whole number or was it alright to leave it in 550-900/π sqr units?
Post by: Sine on November 08, 2018, 11:00:20 pm
Hey Sine. If 2014-2015 is considered normal difficulty. Where does 2016 and 2017 lie on the difficulty scale?On the tougher side of things - I think 2013, 2016, 2017 are probably the hardest three exams.
e.g. in 2013 you could drop 5.5 marks for a 48 however dropping 6 in 2014-2015 would be a 45.
Post by: integrationbyrecognition on November 08, 2018, 11:02:32 pm
constants do my head in lol
Post by: Freddie Hg on November 08, 2018, 11:02:42 pm
Lol there's no way this was comparable to 2014-2015, 2014 and 2015 were dead easy, even 2016 and 2017 were reasonable, this years exam 1 and 2 were completely fuckedman under normal conditions i would smash out exam 1 and exam 2s with relative ease. scoring easily in the above 45 range. under timed conditions, im a complete idiot. i think your perception is skewed due to the latter. (not to be rude, im sure your smarter than me) exam 1 was in my opinion the hardest exam 1 in any vcaa exam, same with exam 2 2017. i hope your ruminative state post exams is just you being a perfectionist and that you aced both if not exam 2 in methods. even if you didnt. it doesnt matter :)
Post by: jazzycab on November 08, 2018, 11:04:22 pm
Yep, it was to the nearest square metre. Whether that answer is accepted will be determined on the assessor's day (which I think will be Saturday)
Was 3C to the nearest whole number or was it alright to leave it in 550-900/π sqr units?
Post by: integrationbyrecognition on November 08, 2018, 11:06:05 pm
Guys how do you already know the answers when we haven't done the exam yet??Fun fact: the exam was today and so the answers are available :P
Post by: Dais_Deorum on November 08, 2018, 11:06:20 pm
Yep, it was to the nearest square metre. Whether that answer is accepted will be determined on the assessor's day (which I think will be Saturday)FML haha
Surely its accepted, I mean if an exact answer is available why wouldn't they... Ugh
Post by: Freddie Hg on November 08, 2018, 11:07:19 pm
i dont get your 4 dii
Was 3C to the nearest whole number or was it alright to leave it in 550-900/π sqr units?
Post by: integrationbyrecognition on November 08, 2018, 11:07:50 pm
man under normal conditions i would smash out exam 1 and exam 2s with relative ease. scoring easily in the above 45 range. under timed conditions, im a complete idiot. i think your perception is skewed due to the latter. (not to be rude, im sure your smarter than me) exam 1 was in my opinion the hardest exam 1 in any vcaa exam, same with exam 2 2017. i hope your ruminative state post exams is just you being a perfectionist and that you aced both if not exam 2 in methods. even if you didnt. it doesnt matter :)I didn't come anywhere nearing exam 1 and 2, what made you think I did? This year's exam 1 was definitely the hardest exam 1 ever, but imo this year's exam 2 was also the hardest, and alot harder than last years exam 2
Post by: jazzycab on November 08, 2018, 11:12:04 pm
i dont get your 4 dii
I didn't check this - neither do I, \(550-\frac{900}{\pi}\approx263.521\)...
Post by: Freddie Hg on November 08, 2018, 11:13:14 pm
I didn't come anywhere nearing exam 1 and 2, what made you think I did? This year's exam 1 was definitely the hardest exam 1 ever, but imo this year's exam 2 was also the hardest, and alot harder than last years exam 2to each their own. idk, we will have to wait for the grade distributions. after all a good maths student only listens to the numbers (cold hard statistics).
Post by: ajs13 on November 08, 2018, 11:14:34 pm
I'm just writing up question 5 now. I'm sorry this is taking so long. I had a 3-hour Engineering exam this morning and so I had to take a break. Solutions to Section B will be up soon :D
all good! will those be coming out tonight or tomo? cause otherwise I'm off to bed
Post by: Dais_Deorum on November 08, 2018, 11:14:52 pm
I didn't check this - neither do I, \(550-\frac{900}{\pi}\approx263.521\)...
Ik its not the required form, but do you think they would accept it? So annoying to think a mark would be lost there
Post by: integrationbyrecognition on November 08, 2018, 11:15:26 pm
to each their own. idk, we will have to wait for the grade distributions. after all a good maths student only listens to the numbers (cold hard statistics).I think I'm the only one who found last years exam 2 easier than today's. Oh well
Post by: jazzycab on November 08, 2018, 11:15:57 pm
Ik its not the required form, but do you think they would accept it? So annoying to think a mark would be lost there
Not if I have the correct answer as the value is different to what I got
Post by: ajs13 on November 08, 2018, 11:17:20 pm
Post by: Lear on November 08, 2018, 11:21:20 pm
Post by: crawlingvines on November 08, 2018, 11:23:31 pm
Post by: undefined on November 08, 2018, 11:26:22 pm
4dii - Would it be sufficient to compare the proportions of both towns for the mark?I said 95% of the proportions of the statsville people were between (a,b) (i forgot the values) and the mathsland (or whatever it was called) population proportion is greater than that interval. Not sure if I'd get a mark for my response.
Post by: jazzycab on November 08, 2018, 11:26:45 pm
4dii - Would it be sufficient to compare the proportions of both towns for the mark?I wouldn't suggest so as, even if two population proportions are different, this may not indicate statistical significance (however, if a proportion is outside of a specified Confidence Interval, it could be considered statistically significant).
Post by: S200 on November 08, 2018, 11:31:57 pm
Reading through the solutions that have been posted so far has made me feel a lot better honestly. I don't even wanna begin to articulate the grief I felt walking out of the exam room after having left 3 questions on the last page blank. My time management for exam 2 went down the drain the minute I spent 5 mins too long on the multi section. C'est la vie :'(Lol. You only left 3 questions?
Cest la ******* double vie....
I left the all but one part of question 4, 'cause I be like "Probability is my strength, what need I fear?"... Except limited time, etc... :'(
Post by: jazzycab on November 08, 2018, 11:32:18 pm
I said 95% of the proportions of the statsville people were between (a,b) (i forgot the values) and the mathsland (or whatever it was called) population proportion is greater than that interval. Not sure if I'd get a mark for my response.
This is, unfortunately, also not likely to get the mark as you have misinterpreted the confidence interval - it doesn't mean that 95% of the population is necessarily inside that range.
If we took infinitely many samples, 95% of the Confidence Intervals constructed (provided they are all 95% CIs) would contain the actual population proportion (whilst 5% will not). This is effectively the reason why we can't compare the proportions from each town - we have the population proportion for Mathsland, but the sample proportion obtained for Statsland may not reflect the actual value (i.e. this particular CI may be one of the 5% that does not contain the actual population proportion). For these types of problems, it is imperative to keep in mind that the sample proportion is dependent on the sample obtained and is therefore a variable, where as the population proportion is constant
Post by: AlphaZero on November 08, 2018, 11:36:14 pm
Get them here: https://atarnotes.com/forum/index.php?topic=181368.msg1083392#msg1083392
Post by: matthewmwps on November 08, 2018, 11:36:55 pm
My answer was:
"the population proportion has a less change of having a slow heart beat (0.142<0.1587)"
Although in my actual answer i did put the names, which i can't now because i've completely forgotten it.
Post by: vox nihili on November 08, 2018, 11:38:18 pm
Finally finished the exam 2 provisional solutions!
Get them here: https://atarnotes.com/forum/index.php?topic=181368.msg1083392#msg1083392
Promise I won't delete these ones.
Thanks so much for this contribution; they're fantastic.
Post by: Siddharth Nichani on November 08, 2018, 11:47:53 pm
Post by: AlphaZero on November 08, 2018, 11:53:57 pm
Promise I won't delete these ones.
Thanks so much for this contribution; they're fantastic.
No worries. I'll be back again tomorrow, and Monday, and my mate will be here for chem and physics :)
Post by: AlphaZero on November 08, 2018, 11:55:40 pm
any chance we could get the mark allocations for each question? (as in what each question was worth, not what information resulted in the mark)
I'll add the mark allocations tomorrow. I'm too tired at the moment.
Post by: Sine on November 08, 2018, 11:57:30 pm
any chance we could get the mark allocations for each question? (as in what each question was worth, not what information resulted in the mark)Sure!
Mark Allocations
All 20 MCQs were worth 1 mark (LOL) ;)
Question 1 - 13 marks
Q1a - 1 mark
Q1b - 1 mark
Q1c - 1 mark
Q1d - 2 marks
Q1e - 2 marks
Q1f - 1 mark
Q1g - 1 mark
Q1hi - 1 mark
Q1hii - 1 mark
Q1hiii - 2 marks
Question 2 - 10 marks
Q2a - 2 marks
Q2b - 2 marks
Q2c - 2 marks
Q2di - 2 marks
Q2dii - 2 marks
Question 3 - 11 marks
Q3a - 1 mark
Q3b - 1 mark
Q3c - 3 marks
Q3d - 1 mark
Q3e - 2 marks
Q3f - 3 marks
Question 4 - 16 marks
Q4a - 1 mark
Q4bi - 1 mark
Q4bii - 1 mark
Q4ci - 2 marks
Q4cii - 2 marks
Q4ciii - 2 marks
Q4di - 1 mark
Q4dii - 1 mark
Q4e - 2 marks
Q4f - 1 mark
Q4g - 2 marks
Question 5 - 10 marks
Q5a - 2 marks
Q5b - 1 mark
Q5c - 2 marks
Q5d - 1 mark
Q5e - 2 marks
Q5f - 1 mark
Q5g - 1 mark
Question 1 - 13 marks
Q1a - 1 mark
Q1b - 1 mark
Q1c - 1 mark
Q1d - 2 marks
Q1e - 2 marks
Q1f - 1 mark
Q1g - 1 mark
Q1hi - 1 mark
Q1hii - 1 mark
Q1hiii - 2 marks
Question 2 - 10 marks
Q2a - 2 marks
Q2b - 2 marks
Q2c - 2 marks
Q2di - 2 marks
Q2dii - 2 marks
Question 3 - 11 marks
Q3a - 1 mark
Q3b - 1 mark
Q3c - 3 marks
Q3d - 1 mark
Q3e - 2 marks
Q3f - 3 marks
Question 4 - 16 marks
Q4a - 1 mark
Q4bi - 1 mark
Q4bii - 1 mark
Q4ci - 2 marks
Q4cii - 2 marks
Q4ciii - 2 marks
Q4di - 1 mark
Q4dii - 1 mark
Q4e - 2 marks
Q4f - 1 mark
Q4g - 2 marks
Question 5 - 10 marks
Q5a - 2 marks
Q5b - 1 mark
Q5c - 2 marks
Q5d - 1 mark
Q5e - 2 marks
Q5f - 1 mark
Q5g - 1 mark
Post by: Globe on November 09, 2018, 12:02:22 am
Post by: tiffanylps09 on November 09, 2018, 12:03:44 am
This is, unfortunately, also not likely to get the mark as you have misinterpreted the confidence interval - it doesn't mean that 95% of the population is necessarily inside that range.Hi for that same question, if i compared the sample sizes of the two towns do you think i might get a mark? Statsland had a sample size way bigger than Mathland..
If we took infinitely many samples, 95% of the Confidence Intervals constructed (provided they are all 95% CIs) would contain the actual population proportion (whilst 5% will not). This is effectively the reason why we can't compare the proportions from each town - we have the population proportion for Mathsland, but the sample proportion obtained for Statsland may not reflect the actual value (i.e. this particular CI may be one of the 5% that does not contain the actual population proportion). For these types of problems, it is imperative to keep in mind that the sample proportion is dependent on the sample obtained and is therefore a variable, where as the population proportion is constant
Post by: S200 on November 09, 2018, 12:07:00 am
any chance we could get the mark allocations for each question? (as in what each question was worth, not what information resulted in the mark)That was 100% given to you with the exam...
But yeah, Sine has the proper answer...
Also, gonna take this op to tell ya to just make one post rather then a few. Double posts just look messy.
You can respond to more than one person from one post...
Post by: reebo on November 09, 2018, 12:15:10 am
The question didn't specify whether they wanted it in radians, do you think this will still be accepted?
Post by: Lear on November 09, 2018, 12:16:12 am
Post by: S200 on November 09, 2018, 12:18:17 am
I gave my answer to 3d in degrees and not radians, so gradient = 2.000.Wait... If 3d was the gradient question, it wasn't 2.00 degrees.
The question didn't specify whether they wanted it in radians, do you think this will still be accepted?
I subbed the provided value into the tan equation (as per Lear, above), giving me 0.035 as the gradient.
Post by: Tadd12345 on November 09, 2018, 12:31:31 am
I got absolutely destroyed by both methods exams, ended up with a 34 thanks to sweet sweet SAC scaling.you're my inspiration brother, I actually love you. And yeah hopefully my sac scaling will help me out, i'm rank 1 and probably got A+ in exam 1 on Wednesday, but I got my actual ass handed to me Thursday methods exam 2. Like seriously, id be happy if I got 60-70%. In all my timed methods practice exams I never got below 80%. but this exam on the other hand was easily the craziest thing I ever had the misfortune to experience.
And in two years I'll be a doctor. *
One.exam.doesn't.change.your.life.
You'll be fine everyone.
*second humble brag, my mediocrity in methods didn't even stop me from landing in the top 10% of my Biomed cohort for maths. Seriously, one exam does not change your life.
MOD EDIT: removed flippant reference to self-harm. If anyone reading this is struggling during exam time, please get help. https://www.lifeline.org.au/about-lifeline/contact-us
Post by: Dais_Deorum on November 09, 2018, 12:40:33 am
you're my inspiration brother, I actually love you. And yeah hopefully my sac scaling will help me out, i'm rank 1 and probably got A+ in exam 1 on Wednesday, but I got my actual ass handed to me Thursday methods exam 2. Like seriously, id be happy if I got 60-70%. In all my timed methods practice exams I never got below 80%. but this exam on the other hand was easily the craziest thing I ever had the misfortune to experience. I actually want to kill myself after that catastrophe
It's alright mate. I know it's hard to see now but you did the best you could, and besides, these exams as Vox mentioned mean f***all in the long run. Don't be too harsh on yourself, and you also have next year to improve. Try to get some rest !! (lol I say that and I have spesh p 1 in 8 hours and 20 mins :)) Stay well!
Post by: S200 on November 09, 2018, 12:50:59 am
Show how muc he know bout normal distribution! :P
Post by: crouchie on November 09, 2018, 07:50:18 am
VCAA 2018 Methods Exam 2 Provisional Solutions
Solutions by Daniel Traicos at TWM Publications
Interesting exam! Definitely some difficult ones!
Well done Dan. I'm sure the community appreciates your effort.
So sorry I wasn't able to do mine in time, I'll work on mine over today/the weekend and put CAS screenshots (TI CX) for those using that.
Thanks again, you're a champ.
Post by: integrationbyrecognition on November 09, 2018, 08:00:50 am
My teacher said that a difficult exam 1 normally means an easier exam 2...How did you find yesterday's exam in terms of difficulty?
Show how muc he know bout normal distribution! :P
The people that wrote these exams legit make them harder each year
Post by: DinWell on November 09, 2018, 08:03:22 am
Well done Dan. I'm sure the community appreciates your effort.Wow, you two are absolute legends. Can’t thank you both enough.
So sorry I wasn't able to do mine in time, I'll work on mine over today/the weekend and put CAS screenshots (TI CX) for those using that.
Thanks again, you're a champ.
Post by: Lear on November 09, 2018, 08:19:15 am
Wow, you two are absolute legends. Can’t thank you both enough.
Ditto.
Jazzycab, Crouchie and Dantraicos. Great work guys.
Post by: AlphaZero on November 09, 2018, 09:15:49 am
Well done Dan. I'm sure the community appreciates your effort.
So sorry I wasn't able to do mine in time, I'll work on mine over today/the weekend and put CAS screenshots (TI CX) for those using that.
Thanks again, you're a champ.
Haha, exam 2s are just a killer to write up nicely. The CAS screenshots I think will really benefit people. Looking forward to reading your solutions soon. See you at spesh E1 :D
Post by: Sean_G on November 09, 2018, 09:34:17 am
How did you guys get 1/8 for the question (on the second last page I think?) finding area? I got a different answer although 1/8 was one of the answers I got using a method.
And for the three-mark question finding distance PQ, was there any other method that was less time-consuming than finding the coordinates of Q than using the distance formula? The distance formula felt like it has been used so much in these two exams.
For the distance PQ you had the angle pi/90 and the hypotenuse distance which was something I can't remember, but you could just use regular trig and solve for the missing length
Post by: crouchie on November 09, 2018, 09:45:16 am
Haha, exam 2s are just a killer to write up nicely. The CAS screenshots I think will really benefit people. Looking forward to reading your solutions soon. See you at spesh E1 :DAgreed. Very hard to write up nicely as the algebra can sometimes get so gnarly. And then the CAS screenshots can take up heaps of space, so have to find efficient ways to show steps (such as solve(derivative(f(x))=0,x) which is 1 step which normally takes 2).
See you at Spesh E1!
Post by: Alexmaths on November 09, 2018, 04:18:34 pm
Post by: DinWell on November 09, 2018, 05:29:44 pm
Can somebody please explain how you were supposed to do question 5 on the short answer? I remember it saying something about an inverse of g, and when I put it in my calculator it gave me a strange result, the answers I've seen have just been basic integrals and such. How we're you meant to go about solving it? I got that 2a/3 x g(2a/3) was equal to 2, but I can't see how this helps. ThanksHere's how I thought about it:
Imagine the graph of g(x). The graph along the y axis is the inverse of g(x) right? In other words, if we rotated the graph of g(x) by 90 degrees counterclockwise and flipped it about the x axis (which is now vertical), we'd get the graph of the inverse of g(x). Then the line x=g(3a/2) can instead by changed to y=g(3a/2) when looking at g(x). So what we really want is the area that g(x) makes with the y axis from y=0 to y=g(3a/2). We find this by taking the area of a rectangle that encloses g(x), and minus the area that g(x) makes with the x axis from x=0 to x=3a/2. The previous question helped you because it made you find, just the area of a rectangle with length 3a/2 and height g(3a/2). It was a subtle hint imo.
Post by: integrationbyrecognition on November 10, 2018, 02:31:04 pm
Am I likely to get 1/3?
For some reason, under exam pressure, I wasn't even able to make the simple link that when I have the gradient of the perpendicular line, I just had to sub the coordinates of "P" and then I have the equation of the line, then equate the line to the original line, and then find the distance. True example of exam pressure haha
Does anyone have a prediction of the a+ cutoff for exam 1 and exam 2 respectively?
Thanks
Post by: AlphaZero on November 10, 2018, 07:19:36 pm
Does anyone have a prediction of the a+ cutoff for exam 1 and exam 2 respectively?
Thanks
I predict the cutoffs will be:
Exam 1: 33-34 / 40
Exam 2: 67-68 / 80
Post by: Worm on November 11, 2018, 06:45:30 pm
I predict the cutoffs will be:
Exam 1: 33-34 / 40
Exam 2: 67-68 / 80
Hi dantraicos...
Solutions look good. The only one you buggered up is 3f... You can't use trig rule as it is not a triangle, as the angle pi/90 is with the horizontal, not the point P... Otherwise everything else looks correct.
cheers,
Worm
Post by: AlphaZero on November 11, 2018, 07:19:40 pm
Hi dantraicos...
Solutions look good. The only one you buggered up is 3f... You can't use trig rule as it is not a triangle, as the angle pi/90 is with the horizontal, not the point P... Otherwise everything else looks correct.
cheers,
Worm
Oh my!!! I can't believe I fell for that :( Thanks mate
Post by: Lear on November 11, 2018, 07:26:35 pm
Hi dantraicos...
Solutions look good. The only one you buggered up is 3f... You can't use trig rule as it is not a triangle, as the angle pi/90 is with the horizontal, not the point P... Otherwise everything else looks correct.
cheers,
Worm
Wait....crap. If a person used the triangle method do you think all 3 marks would be taken off?
Post by: AlphaZero on November 11, 2018, 07:28:06 pm
Wait....crap. If a person used the triangle method do you think all 3 marks would be taken off?
Unfortunately, I think so. It's not a viable method, and you don't get the correct answer.
Post by: Sine on November 11, 2018, 07:49:09 pm
Wait....crap. If a person used the triangle method do you think all 3 marks would be taken off?unlikely that you actually lose all 3 marks since assessors normally don't like to give out 0/3 when a student has actually written something down. If you have covered some methods concept in your working out you may be able to get 1/3.
Post by: JamesMaths on November 15, 2018, 11:12:14 pm
(Part 1).
PDF on my web site:
https://unimelb.academia.edu/JamesCui
Provide Tutorials in Mathematical Methods and Specialist Mathematics in Balwyn.
Regards
James.
Post by: JamesMaths on November 15, 2018, 11:14:30 pm
(Part 2).
PDF on my web site:
https://unimelb.academia.edu/JamesCui
Provide Tutorials in Mathematical Methods and Specialist Mathematics in Balwyn.
Regards
James.
Post by: JamesMaths on November 15, 2018, 11:16:02 pm
(Part 3).
PDF on my web site:
https://unimelb.academia.edu/JamesCui
Provide Tutorials in Mathematical Methods and Specialist Mathematics in Balwyn.
Regards
James.
Post by: mn123 on February 12, 2019, 05:35:14 pm
exam 1
https://www.vcaa.vic.edu.au/Documents/exams/mathematics/2018/mm1_examrep18.pdf
exam 2
https://www.vcaa.vic.edu.au/Documents/exams/mathematics/2018/mm2_examrep18.pdf
Post by: Sine on February 12, 2019, 05:41:02 pm
exam reports are finally available 8)interesting that exam 1 8b only 3% got full marks on and the final question only 4%
exam 1
https://www.vcaa.vic.edu.au/Documents/exams/mathematics/2018/mm1_examrep18.pdf
exam 2
https://www.vcaa.vic.edu.au/Documents/exams/mathematics/2018/mm2_examrep18.pdf
Post by: mn123 on February 12, 2019, 05:47:03 pm
interesting that exam 1 8b only 3% got full marks on and the final question only 4%what % did you think would get full marks on 8b and 9d?
Post by: Sine on February 12, 2019, 05:52:39 pm
what % did you think would get full marks on 8b and 9d?didn't really think of it at the time but historically exam tends not to be that difficult. Usually the most difficult question is still answered correctly by ~10% of the cohort.
Post by: S_R_K on February 12, 2019, 06:23:46 pm
interesting that exam 1 8b only 3% got full marks on and the final question only 4%
Re, 8b, there are a few things on there that a very large proportion of the cohort would have overlooked or not applied under exam pressure.
1: Realising that e^(4x) > 0 for all x, hence the initial equation can be divided through by e^(4x) without losing solutions.
2: Getting a discriminant of 4 and being confused about how there could be only one solution with a positive discriminant.
3: Not realising that the second solution is discarded when division by zero occurs (rather than the square-rooting of a negative, which is a more common experience for students).
Most of these are subtleties that are more commonly addressed in Specialist. Of course one would expect students doing both subjects to have performed better on this question; but unfortunately often students compartmentalise their knowledge / skills, and don't apply relevant knowledge / skills across contexts.