ATAR Notes: Forum

Archived Discussion => Mathematics/Science/Technology => 2014 => Exam Discussion => Victoria => Mathematical Methods CAS => Topic started by: Zealous on November 06, 2014, 05:05:30 pm

Title: Methods Exam 2: Discussion!
Post by: Zealous on November 06, 2014, 05:05:30 pm
So, how was it?

Was there a lot of calculus this year? More probability than last year? Any questions which were very difficult to do?

If anyone has a copy of the exam, feel free to create a new topic and upload it there. :D

Hey guys, hope the exam went well!

Just as a note, please reserve this thread for exam related discussion and refrain from asking study score related questions in this thread. I have split the majority of posts regarding study scores into this thread.

If you wish to ask questions relating to study score approximations please head to the Victorian Technical Score Discussion board and post in a relevant already made thread, or make your own.

Thank you!
Title: Re: Methods Exam 2: Discussion!
Post by: thushan on November 06, 2014, 05:31:31 pm
From one of my students:

"the multiple choice was like 5 times harder than any other year; short answer not hard, but very technical. some hard questions"
Title: Re: Methods Exam 2: Discussion!
Post by: Tasmania Jones on November 06, 2014, 05:34:52 pm
Multiple choice was quite straightforward, the first few questions of short answer were really simple, like methods 1/2 style, and the last question was slightly more difficult although VCAA guided you along quite well. The exam was much easier than last year and probably 2012.
I'm reasonably happy, unlike exam 1
Title: Re: Methods Exam 2: Discussion!
Post by: Tasmania Jones on November 06, 2014, 05:36:01 pm
Oh yeah, and the Tasmania Jones question was really disappointing actually. A Viking statue in Greenland, within a melting ice cylinder :(
Title: Re: Methods Exam 2: Discussion!
Post by: Sayf44 on November 06, 2014, 05:36:38 pm
Multiple choice this year was extremely time consuming and and more difficult than ever before. ER was pretty easy compared to previous years.
Title: Re: Methods Exam 2: Discussion!
Post by: Kaleidoscope on November 06, 2014, 05:37:40 pm
 I agree - the multiple choice pushed you more than in previous years, but the extended response was fairly straightforward
Title: Re: Methods Exam 2: Discussion!
Post by: Robert123 on November 06, 2014, 05:39:59 pm
This exam felt a lot better than last years one.
Multiple choice wasn't too bad, there was some annoying ones like the second last question. The short answer was quite accessible and was fairly do able if you know how to use your CAS really well.
Did anyone else got 2031 for the year where the top of the statue is out of the ice block?
Title: Re: Methods Exam 2: Discussion!
Post by: rosieee on November 06, 2014, 05:41:18 pm
what do people think the cut off will be for a and a+?
Title: Re: Methods Exam 2: Discussion!
Post by: bpearson on November 06, 2014, 05:42:15 pm
I found that the MC was pretty straightforward, very easy to do with a calc, but time consuming. For me the last part of every question, except the first, was quite hard, and a lot of the cohort agrees.
Title: Re: Methods Exam 2: Discussion!
Post by: BLACKCATT on November 06, 2014, 05:42:49 pm
I found it very long...
Title: Re: Methods Exam 2: Discussion!
Post by: bobisnotmyname on November 06, 2014, 05:43:18 pm
This exam felt a lot better than last years one.
Multiple choice wasn't too bad, there was some annoying ones like the second last question. The short answer was quite accessible and was fairly do able if you know how to use your CAS really well.
Did anyone else got 2031 for the year where the top of the statue is out of the ice block?
oh my good, examinaer yells five minutes to go, I guess that question for 2031 or 2032, omg what a guess
Title: Re: Methods Exam 2: Discussion!
Post by: bpearson on November 06, 2014, 05:43:59 pm
Any one got the answers for the MC?
I wrote mine down on my calc to check.
Title: Re: Methods Exam 2: Discussion!
Post by: rosieee on November 06, 2014, 05:44:14 pm
I found the whole last question really difficult.. didn't answer any of it :(
Title: Re: Methods Exam 2: Discussion!
Post by: theshunpo on November 06, 2014, 05:44:59 pm
I agree, multiple choice was more time consuming rather than difficult, took roughly 25 to 30 minutes for me I think, compared with 18-23 in practise exams. Maybe it was just
the conditions of the exam that made it feel longer, not sure...
Title: Re: Methods Exam 2: Discussion!
Post by: apoorva1996 on November 06, 2014, 05:46:32 pm
I found the multiple choice complicated but the rest was alright except for the last question, that lost me. The only thing was I ran out of time and left questions blank. :( I couldve finished everything if I had the time ...
Title: Re: Methods Exam 2: Discussion!
Post by: kilena on November 06, 2014, 05:46:54 pm
I found the whole last question really difficult.. didn't answer any of it :(

Same, I did part a and b but got stuck with the rest.
Title: Re: Methods Exam 2: Discussion!
Post by: nikegod on November 06, 2014, 05:48:51 pm
Pretty good exam - but perhaps overkill on the MC. Anybody who managed to complete the entire paper without guessing a couple MCs has impressed me. No real killer question in ER, but I found ~1/3rd of the multis to be genuinely difficult, rather than the usual amount which is around half that.
Title: Re: Methods Exam 2: Discussion!
Post by: d4m0 on November 06, 2014, 05:50:41 pm
I found the multiple choice complicated but the rest was alright except for the last question, that lost me. The only thing was I ran out of time and left questions blank. :( I couldve finished everything if I had the time ...

This was exactly my experience as well, seemed like they designed it to punish people who took too long on the multiple choice (ie me)
Title: Re: Methods Exam 2: Discussion!
Post by: katiesaliba on November 06, 2014, 05:51:01 pm
I feel like I just did a year 11 methods exam...seriously wasn't prepared for those type of questions  ??? Ran out of time and ended up guessing quite a few MC.  :-\
Title: Re: Methods Exam 2: Discussion!
Post by: apoorva1996 on November 06, 2014, 05:52:19 pm
Anybody who managed to complete the entire paper without guessing a couple MCs has impressed me.
at the end I think I guessed like 7 mc
Title: Re: Methods Exam 2: Discussion!
Post by: vcestudent123 on November 06, 2014, 05:53:30 pm
The Multi choice was a lot harder than last year's and the last few years imo..
but the S.A. was much easier than last year's.
We were definitely luckier than the year 12s doing Methods last year.

It was definitely time consuming though... I had to guess many multiple choice and left 1 S.A unanswered because of the time limit.
Title: Re: Methods Exam 2: Discussion!
Post by: BLACKCATT on November 06, 2014, 05:54:13 pm
I'd rather last years exam ._.
Title: Re: Methods Exam 2: Discussion!
Post by: Mieow on November 06, 2014, 05:54:31 pm
A lot more do-able but felt much longer than previous years. I know I already lost about 10 marks just coz I didn't finish the last question  :-\
Title: Re: Methods Exam 2: Discussion!
Post by: Edward Elric on November 06, 2014, 05:54:37 pm
I found this years paper very accessible moreso in previous years (2012,2013) multiple choice was a killer at the end, but extended response were not overly difficult. Overall I'm pretty happy, now to spesh
Title: Re: Methods Exam 2: Discussion!
Post by: chuck981996 on November 06, 2014, 05:54:53 pm
Just put some suggested solutions in a new thread! Let me know what you think :)
Title: Re: Methods Exam 2: Discussion!
Post by: vcestudent123 on November 06, 2014, 05:55:44 pm
I'd rather last years exam ._.
Some of the S.A questions last year were crazy though.
Title: Re: Methods Exam 2: Discussion!
Post by: kilena on November 06, 2014, 05:57:54 pm
I found mc to be easy, guessing around 3? Some of the short answers questions, however were hard and confusing. I much prefer 2013 exam 2.
Title: Re: Methods Exam 2: Discussion!
Post by: Sam_4331 on November 06, 2014, 05:58:46 pm
Just put some suggested solutions in a new thread! Let me know what you think :)

where?
Title: Re: Methods Exam 2: Discussion!
Post by: BLACKCATT on November 06, 2014, 05:58:51 pm
Some of the S.A questions last year were crazy though.

It's better than not finishing with adequate time to check over answers, leading to careless mistakes and having to guess MC
Title: Re: Methods Exam 2: Discussion!
Post by: jkpha5 on November 06, 2014, 05:59:20 pm
Any chance of getting a set of solutions just like yesterday for exam 1? I'm quite curious as to what the answers were :)
Title: Re: Methods Exam 2: Discussion!
Post by: IndefatigableLover on November 06, 2014, 05:59:43 pm
Personally, MCQ was a step up compared to previous years whilst short answer was pretty easy compared to other years (I'm looking at you 2011 :P )
Overall, finished with 15 minutes to spare checking over MCQ since they were the ones that stumped me in the end :@

A few people were also in the same position as me at school too... Seeing a A+ cutoff or 72/80 if not higher imo :|
Title: Re: Methods Exam 2: Discussion!
Post by: vcestudent123 on November 06, 2014, 06:00:43 pm
It's better than not finishing with adequate time to check over answers, leading to careless mistakes and having to guess MC
When you put it that way... I agree.
Title: Re: Methods Exam 2: Discussion!
Post by: Aman476 on November 06, 2014, 06:02:10 pm
Overall a very easy exam 2, which is bad for me because I guessed the last multiple choice question and the very last short answer (only got one tangent equation not both) so at least 3 marks gone - while a lot of people would have aced that whole thing hahha hopefully I can still hit over 46 with only losing two marks on exam 1 hahahha yes I got 2031! Did everyone get 2 for v^3+u^3 that last multichoice I had no clue I guessed e but everyone says it was a
Title: Re: Methods Exam 2: Discussion!
Post by: Jnf17 on November 06, 2014, 06:03:00 pm
Chuck - for 5cii. I had d < 1.
If d > 3 wouldn't you have two negative x solutions?
I may be wrong - just checking.
Title: Re: Methods Exam 2: Discussion!
Post by: Jnf17 on November 06, 2014, 06:04:11 pm
Overall a very easy exam 2, which is bad for me because I guessed the last multiple choice question and the very last short answer (only got one tangent equation not both) so at least 3 marks gone - while a lot of people would have aced that whole thing hahha hopefully I can still hit over 46 with only losing two marks on exam 1 hahahha yes I got 2031! Did everyone get 2 for v^3+u^3 that last multichoice I had no clue I guessed e but everyone says it was a

Suggested solutions by Chuck got u^3 + v^3 = 4 which is what I got. :)
Title: Re: Methods Exam 2: Discussion!
Post by: althepal on November 06, 2014, 06:04:34 pm
Overall a very easy exam 2, which is bad for me because I guessed the last multiple choice question and the very last short answer (only got one tangent equation not both) so at least 3 marks gone - while a lot of people would have aced that whole thing hahha hopefully I can still hit over 46 with only losing two marks on exam 1 hahahha yes I got 2031! Did everyone get 2 for v^3+u^3 that last multichoice I had no clue I guessed e but everyone says it was a

I got u^3 + v^3 = 4....uh oh
Title: Re: Methods Exam 2: Discussion!
Post by: speedy on November 06, 2014, 06:05:29 pm
Chuck - for 5cii. I had d < 1.
If d > 3 wouldn't you have two negative x solutions?
I may be wrong - just checking.

I got d < 1, but I did it really quickly so idk.
Title: Re: Methods Exam 2: Discussion!
Post by: RKTR on November 06, 2014, 06:05:43 pm
guys what happens if i have the correct equations of tangents but when i  rewrite them in a small box , i copy one of them wrong ?
Title: Re: Methods Exam 2: Discussion!
Post by: rosieee on November 06, 2014, 06:05:55 pm
i probably lost 20 marks  :'(
omg so sad
anyone have predictions for my study score?
Title: Re: Methods Exam 2: Discussion!
Post by: theshunpo on November 06, 2014, 06:06:52 pm
I got u^3 + v^3 = 4....uh oh

Yeah i got 4 as well, asked two friends they said the same. Should be right.
Title: Re: Methods Exam 2: Discussion!
Post by: thebigleague on November 06, 2014, 06:06:58 pm
Do you still get full marks if you gave an exact answer instead of 'correct to two decimal places' ? think i may have done this for question 3)a
Title: Re: Methods Exam 2: Discussion!
Post by: BLACKCATT on November 06, 2014, 06:07:24 pm
Do you still get full marks if you gave an exact answer instead of 'correct to two decimal places' ? think i may have done this for question 3)a

no
Title: Re: Methods Exam 2: Discussion!
Post by: paulthegreen on November 06, 2014, 06:07:54 pm
I got d < 1, but I did it really quickly so idk.

I think I also got d < 1
Title: Re: Methods Exam 2: Discussion!
Post by: Blondie21 on November 06, 2014, 06:08:06 pm
Chuck - for 5cii. I had d < 1.
If d > 3 wouldn't you have two negative x solutions?
I may be wrong - just checking.

Yeah I don't get why d>3?

Do you still get full marks if you gave an exact answer instead of 'correct to two decimal places' ? think i may have done this for question 3)a

I doubt it
Title: Re: Methods Exam 2: Discussion!
Post by: jumcakes on November 06, 2014, 06:10:41 pm
My multiple choice answers are
Title: Re: Methods Exam 2: Discussion!
Post by: forchina on November 06, 2014, 06:11:26 pm
I got 1<=d<3
Title: Re: Methods Exam 2: Discussion!
Post by: Blondie21 on November 06, 2014, 06:14:14 pm
Yeah i got 4 as well, asked two friends they said the same. Should be right.

Yeah I got this too
Title: Re: Methods Exam 2: Discussion!
Post by: RKTR on November 06, 2014, 06:15:29 pm
My multiple choice answers are
  • A
  • D
  • D
  • E
  • C
  • B
  • E
  • A
  • A
  • E
  • E
  • C
  • C
  • E
  • B
  • C
  • B
  • B
  • C
  • D
  • D
  • E


same for all of them . hope we got all of them right
Title: Re: Methods Exam 2: Discussion!
Post by: Jnf17 on November 06, 2014, 06:19:17 pm
My multiple choice answers are
  • A
  • D
  • D
  • E
  • C
  • B
  • E
  • A
  • A
  • E
  • E
  • C
  • C
  • E
  • B
  • C
  • B
  • B
  • C
  • D
  • D
  • E

Yeah I got all the same except for 21 which I guessed.
Title: Re: Methods Exam 2: Discussion!
Post by: Aman476 on November 06, 2014, 06:20:22 pm
Omg I got the same I guessed e  for 22 hahah
Title: Re: Methods Exam 2: Discussion!
Post by: rice on November 06, 2014, 06:20:44 pm
Goodbye Methods score, goodbye Methods scaling, fml
Title: Re: Methods Exam 2: Discussion!
Post by: sisyphus on November 06, 2014, 06:28:00 pm
I only got about 70%, what grade would that be?
Title: Re: Methods Exam 2: Discussion!
Post by: BLACKCATT on November 06, 2014, 06:29:58 pm
someone please help me!!
If ive lost 20 marks are my chances for 35 raw a zero?

It depends on your exam 1 and SACS as well.. And how the rest of the state goes.
Title: Re: Methods Exam 2: Discussion!
Post by: swaggydawg on November 06, 2014, 06:30:35 pm
Today, we must all commemorate the efforts of one very average student. This student, namely me, has risen to the likes of Jesus in terms of their guessing ability, for out of the 10 MC questions guessed, 9 were guessed correctly.

In other news, I didn't use -10 in the T-Jones related rates question. Any penalties for this or would they let it slip?
Title: Re: Methods Exam 2: Discussion!
Post by: rosieee on November 06, 2014, 06:32:07 pm
It depends on your exam 1 and SACS as well.. And how the rest of the state goes.

but everyone seems to have done really well
and people are saying the cut off for A+ will be higher, so ultimately my chances are pretty low right?
Title: Re: Methods Exam 2: Discussion!
Post by: Aman476 on November 06, 2014, 06:33:39 pm
I've lost 4 marks at best 6 at worst , that plus two marks lost yesterday there goes 46/47 raw haha fk
Title: Re: Methods Exam 2: Discussion!
Post by: Fick on November 06, 2014, 06:35:06 pm
are my chances for a 35 raw gone if ive lost 20 marks??

no way. if you got 32-35/40 in exam 1 then you are looking at 38+
Title: Re: Methods Exam 2: Discussion!
Post by: chuck981996 on November 06, 2014, 06:36:36 pm
Hey just a heads up that there are some errors in the solutions I posted: they're listed in the separate thread :)
Title: Re: Methods Exam 2: Discussion!
Post by: S61778 on November 06, 2014, 06:39:08 pm
For the question where you had to find the 2 tangents, I found the required p values and then subbed them in to find the y values. Wrote the co-ordinates out instead of finding the equations. How many marks lost?
Title: Re: Methods Exam 2: Discussion!
Post by: thushan on November 06, 2014, 06:39:57 pm
Q21 seems to be one that was commonly found difficult - I got D for it.

A = area of two triangles + area of rectangle (if you split it up)
= pcos(x)psin(x) + p^2sin(x)
= p^2(sin(x)+cos(x) + sin(x))

If you graph y = sin(x)cos(x) + sin(x) you'll find there's one local maximum. Work out stationary point, x = pi/3.
Title: Re: Methods Exam 2: Discussion!
Post by: zatotep on November 06, 2014, 06:41:12 pm
So with a relatively easy exam 2 what will the cutoff for a 45 study score be? 113/120 or higher?
Title: Re: Methods Exam 2: Discussion!
Post by: rosieee on November 06, 2014, 06:41:57 pm
no way. if you got 32-35/40 in exam 1 then you are looking at 38+

really?! idont think so though cause the cut offs are gonna be way higher :(
Title: Re: Methods Exam 2: Discussion!
Post by: Yuki N. on November 06, 2014, 06:42:21 pm
Q21 seems to be one that was commonly found difficult - I got D for it.

A = area of two triangles + area of rectangle (if you split it up)
= pcos(x)psin(x) + p^2sin(x)
= p^2(sin(x)+cos(x) + sin(x))

If you graph y = sin(x)cos(x) + sin(x) you'll find there's one local maximum. Work out stationary point, x = pi/3.
can confirm.

Ugh what a joke. A plus cutoff probs above 70...

Anyone know what 38-39 exam 1, 80/80 exam 2 will get me? :/
Title: Re: Methods Exam 2: Discussion!
Post by: Mieow on November 06, 2014, 06:42:43 pm
For the question about plants and heights it said "to the nearest millimetre" and i literally converted the final answer to millimetres. Is that gonna cost me the mark or nah?
Title: Re: Methods Exam 2: Discussion!
Post by: RKTR on November 06, 2014, 06:44:00 pm
Quote from: Mieow link=topic=157439.msg789169#msg78916 9 date=1415259763
For the question about plants and heights it said "to the nearest millimetre" and i literally converted the final answer to millimetres. Is that gonna cost me the mark or nah?

I did the same.
Title: Re: Methods Exam 2: Discussion!
Post by: rosieee on November 06, 2014, 06:44:29 pm
I did the same.

omg same omg
now ive lost even more marks
Title: Re: Methods Exam 2: Discussion!
Post by: timc on November 06, 2014, 06:44:43 pm
Q21 seems to be one that was commonly found difficult - I got D for it.

A = area of two triangles + area of rectangle (if you split it up)
= pcos(x)psin(x) + p^2sin(x)
= p^2(sin(x)+cos(x) + sin(x))

If you graph y = sin(x)cos(x) + sin(x) you'll find there's one local maximum. Work out stationary point, x = pi/3.
fuck yeah guessed right
Title: Re: Methods Exam 2: Discussion!
Post by: jumcakes on November 06, 2014, 06:45:35 pm
For the question about plants and heights it said "to the nearest millimetre" and i literally converted the final answer to millimetres. Is that gonna cost me the mark or nah?

Would probably cost the mark if you wrote 191.blah millimetres, 191 millimetres is acceptable of course, so is 19.1 cm
Title: Re: Methods Exam 2: Discussion!
Post by: Robert123 on November 06, 2014, 06:51:39 pm
I'm hoping that the scaling this year would be similar to last year. That would be really awesome  :)
Title: Re: Methods Exam 2: Discussion!
Post by: vididid on November 06, 2014, 06:53:41 pm
so a+ cutoff? most likely over 75% or 85% any estimates guys?
Title: Re: Methods Exam 2: Discussion!
Post by: Yuki N. on November 06, 2014, 06:54:19 pm
so a+ cutoff? most likely over 75% or 85% any estimates guys?
Probably about 90 percent
Title: Re: Methods Exam 2: Discussion!
Post by: shroomer101 on November 06, 2014, 06:56:01 pm
I hope the cut off isn't too high!i lost 13 marks in total for exam 2 and got 37/40 for exam 1 I really wanted a 40 but now i'm not sure if i can get it. Overall the exam was alright but i screwed up on stupid things ah well now time for spesh...tonight will be interesting...
Title: Re: Methods Exam 2: Discussion!
Post by: thushan on November 06, 2014, 06:57:10 pm
Looking at the paper, I doubt that the A+ cut will be 90%.

My guess would be about 65-69/80 for A+.
Title: Re: Methods Exam 2: Discussion!
Post by: GeniDoi on November 06, 2014, 06:57:32 pm
Probably about 90 percent

This exam was slightly easier than 2013 but not by much. The MC was on a completely different level to it. 62-63/80 cutoff is my prediction, considering 2013s was 61.5/80.
Title: Re: Methods Exam 2: Discussion!
Post by: shroomer101 on November 06, 2014, 07:00:41 pm
Looking at the paper, I doubt that the A+ cut will be 90%.

My guess would be about 65-69/80 for A+.

omg if its around 65 my life would be perfect haha I honestly just want A+!!
Title: Re: Methods Exam 2: Discussion!
Post by: Mujteba on November 06, 2014, 07:09:26 pm
Whole last question was very similar to one from 2006 (sample) exam; just recycled and polished.
Title: Re: Methods Exam 2: Discussion!
Post by: Mieow on November 06, 2014, 07:23:18 pm
I think a lot of you guys could probably take your questions about what SS you're gonna get here

Study Score Prediction Compilation (please refer to the first page)
Title: Re: Methods Exam 2: Discussion!
Post by: Jon-_- on November 06, 2014, 07:27:15 pm
I'm about to go crawl in a hole and bury myself under. I just realised that I left everything with two decimal places for that plant question because I was obviously too dumb to realise that a millimeter is a 1/10 of a centimeter. I can't believe I didn't even pick up on it when I checked over!

Please tell me I'm not going to loose all my marks because I did really well on that question, other than my retarded moment.
Title: Re: Methods Exam 2: Discussion!
Post by: keltingmeith on November 06, 2014, 07:34:40 pm
I'm about to go crawl in a hole and bury myself under. I just realised that I left everything with two decimal places for that plant question because I was obviously too dumb to realise that a millimeter is a 1/10 of a centimeter. I can't believe I didn't even pick up on it when I checked over!

Please tell me I'm not going to loose all my marks because I did really well on that question, other than my retarded moment.

You'll possibly lose an answer mark for each question you've done it in (looks like two marks to me?), but you might just lose one mark overall. I don't know VCAAs policy on units (we only just solved one dilemma on units half a week ago, actually!)
Title: Re: Methods Exam 2: Discussion!
Post by: Phy124 on November 06, 2014, 07:49:55 pm
Hey guys, hope the exam went well!

Just as a note, please reserve this thread for exam related discussion and refrain from asking study score related questions in this thread. I have split the majority of posts regarding study scores into this thread.

If you wish to ask questions relating to study score approximations please head to the Victorian Technical Score Discussion board and post in a relevant already made thread, or make your own.

Thank you!
Title: Re: Methods Exam 2: Discussion!
Post by: S61778 on November 06, 2014, 08:00:51 pm
For the question where you had to find the equations
Of the 2 tangents that intersected, I found the p values
And subbed them in to find the y values. The. I just wrote the
Co-ordinates instead of the tangent equation. How many
Marks would I lose? Also for the tangen line equation
On the last page, I left it in the form
y-y1=m(x-x1) is this okay?

Thanks
Title: Re: Methods Exam 2: Discussion!
Post by: T-Infinite on November 06, 2014, 08:04:27 pm
You'll possibly lose an answer mark for each question you've done it in (looks like two marks to me?), but you might just lose one mark overall. I don't know VCAAs policy on units (we only just solved one dilemma on units half a week ago, actually!)
In regards to units, for one of the question I carelessly put metres per year instead of metres per hour... would I lose a mark even if the answer is correct?
Title: Re: Methods Exam 2: Discussion!
Post by: keltingmeith on November 06, 2014, 08:14:21 pm
In regards to units, for one of the question I carelessly put metres per year instead of metres per hour... would I lose a mark even if the answer is correct?
Yes - your answer is wrong if you have the wrong units.
Title: Re: Methods Exam 2: Discussion!
Post by: felix-onea on November 06, 2014, 08:19:13 pm
In regards to units, for one of the question I carelessly put metres per year instead of metres per hour... would I lose a mark even if the answer is correct?
shouldn't it be m/year anyway?
since dV/dt is 10m^3/year
Title: Re: Methods Exam 2: Discussion!
Post by: vizard12 on November 06, 2014, 08:23:54 pm
Hey for question 4d i calculated the z value using .15 as area which gives  z=-1.03643.
I then calculated standerd devition using squareroot(intergral from 0 to 50 of (x-25)^2 * h(x) dx).
then i solved z=(x-25)/standard deviation just caluated for x.
i got 13.7227 for x, have i completely overcomplicated this and will get 0 marks?
cheers
Title: Re: Methods Exam 2: Discussion!
Post by: Raza.aquarius on November 06, 2014, 08:46:49 pm
Can anyone please link me to the solutions?
Title: Re: Methods Exam 2: Discussion!
Post by: Lizzy7 on November 06, 2014, 08:47:52 pm
Can anyone please link me to the solutions?

2014 Mathematical Methods Exam 2 Paper + Solutions (MCQ + ER)

:)
Title: Re: Methods Exam 2: Discussion!
Post by: chaoz on November 06, 2014, 08:50:27 pm
this might be a weird question, but will i lose a mark if i didnt write the units for one question (the question already stated the units tho..)
Title: Re: Methods Exam 2: Discussion!
Post by: courtney01 on November 06, 2014, 08:54:47 pm
this might be a weird question, but will i lose a mark if i didnt write the units for one question (the question already stated the units tho..)
I was wondering the same thing, i might have done it all through the exam :/
Title: Re: Methods Exam 2: Discussion!
Post by: GeniDoi on November 06, 2014, 09:03:43 pm
In methods, you NEVER are required to write units. Ever. There are no exceptions. Every question can be answered to full marks without writing units.

The only time you write units is if YOU have changed the units of the answer you are stating, in which case you have changed the magnitude of the answer and must justify it with the appropriate unit of measurement. Like the question "Find the height in cm of the plant to the nearest mm" or whatever it was, unless you converted your answer to mm, you can simply leave it unitless.
Title: Re: Methods Exam 2: Discussion!
Post by: chaoz on November 06, 2014, 09:13:25 pm
Awesome thanks !! :D :D ;D ;D
I can stop worrying and focus on preparing for tmr   :P
Title: Re: Methods Exam 2: Discussion!
Post by: althepal on November 06, 2014, 09:14:27 pm
For 2f. I used 10 instead of -10 and ended up with a positive answer. How many marks will I lose for that?
Title: Re: Methods Exam 2: Discussion!
Post by: NyaTaku on November 06, 2014, 09:28:43 pm
In methods, you NEVER are required to write units. Ever. There are no exceptions. Every question can be answered to full marks without writing units.

The only time you write units is if YOU have changed the units of the answer you are stating, in which case you have changed the magnitude of the answer and must justify it with the appropriate unit of measurement. Like the question "Find the height in cm of the plant to the nearest mm" or whatever it was, unless you converted your answer to mm, you can simply leave it unitless.

That's really interesting, thanks! Always thought units were required and allocated 2 minutes to checking them in today's exam.
Title: Re: Methods Exam 2: Discussion!
Post by: GeniDoi on November 06, 2014, 09:39:55 pm
For 2f. I used 10 instead of -10 and ended up with a positive answer. How many marks will I lose for that?

1 mark.
Title: Re: Methods Exam 2: Discussion!
Post by: vceisajoke on November 06, 2014, 10:35:35 pm
"Time is up. Stop writing," said the exam supervisor. I breathed a sigh of relief. Mathematical Methods is finally over. "Make sure you've filled in your answer sheet." My heart stopped. I looked over at my multiple choice answer sheet and, after having done every trial without filling one in, realised that I had forgotten to fill it in.
The next moments involved vigorous hand movements and lots of lead.

Dayum, I should write a novel.
Title: Re: Methods Exam 2: Discussion!
Post by: de on November 06, 2014, 10:40:06 pm
Just to clarify. Have vcaa marked people down in the past for not writing 1000 WOMBATS instead of just 1000. Seems a bit over the top.
Title: Re: Methods Exam 2: Discussion!
Post by: vceisajoke on November 06, 2014, 10:59:14 pm
Just to clarify. Have vcaa marked people down in the past for not writing 1000 WOMBATS instead of just 1000. Seems a bit over the top.

No that's impossible.
Title: Re: Methods Exam 2: Discussion!
Post by: jumcakes on November 06, 2014, 11:01:42 pm
Just to clarify. Have vcaa marked people down in the past for not writing 1000 WOMBATS instead of just 1000. Seems a bit over the top.

I think this should be fine regardless - firstly VCAA haven't said anything in exam reports about forgetting units, and we're finding n(10) = 1200 + 400 cos(pi*10/3) = 1000; the value of the function is 1000, so the population is 1000 wombats.
Title: Re: Methods Exam 2: Discussion!
Post by: GeniDoi on November 06, 2014, 11:07:22 pm
No that's impossible.

As absurd as it is to model a biological population by a sin curve, of all things, wombats would count as a unit of measurement if it was specialist or physics. Units are not required in methods however.

Title: Re: Methods Exam 2: Discussion!
Post by: ddfcfyu09 on November 06, 2014, 11:25:00 pm
Hey guys
i just realised i forgot to sign on the multiple choice sheet.
am i screwed?
Title: Re: Methods Exam 2: Discussion!
Post by: de on November 06, 2014, 11:26:58 pm
What about for the maximum/minimum population question. Did you need to write WOMBATS there. Sorry about this. I'm just really concerned. Sad to get everything and lose marks on something like that.
Title: Re: Methods Exam 2: Discussion!
Post by: NyaTaku on November 06, 2014, 11:31:30 pm
Does anyone know if marks are lost for writing mg/hr instead of mg/L/hr for Q3ci?
Title: Re: Methods Exam 2: Discussion!
Post by: nikegod on November 07, 2014, 06:09:09 am
Does anyone know if marks are lost for writing mg/hr instead of mg/L/hr for Q3ci?

Hm, I doubt it - remember, examiners want to reward you, not penalise you almost vindictively.

If your maths is good, your mark should be too; don't worry too much about the rest.
Title: Re: Methods Exam 2: Discussion!
Post by: Kingpoo69 on November 07, 2014, 05:21:17 pm
Hey guys
i just realised i forgot to sign on the multiple choice sheet.
am i screwed?
We needed to sign it? Oh darn. Oh darn.
Title: Re: Methods Exam 2: Discussion!
Post by: CSmith23 on November 08, 2014, 11:52:18 am
For Question 2, would a mark be lost for not having absolute values in the log function? I.e. ln(2x-1) without absolute values.

Obviously with these numbers it worked without the absolute values, but I know to be entirely correct it needs the absolute value, would I lose a mark for it though?

Thanks

Title: Re: Methods Exam 2: Discussion!
Post by: Orb on November 08, 2014, 11:54:18 am
For Question 2, would a mark be lost for not having absolute values in the log function? I.e. ln(2x-1) without absolute values.

Obviously with these numbers it worked without the absolute values, but I know to be entirely correct it needs the absolute value, would I lose a mark for it though?

Thanks

Yes, unfortunately :/
Title: Re: Methods Exam 2: Discussion!
Post by: keltingmeith on November 08, 2014, 12:03:30 pm
For Question 2, would a mark be lost for not having absolute values in the log function? I.e. ln(2x-1) without absolute values.

Obviously with these numbers it worked without the absolute values, but I know to be entirely correct it needs the absolute value, would I lose a mark for it though?

Thanks

Actually, I don't think you would - an examiner could just interpret that as you knowing which side of the log you wanted, and actually call it genius instead of a silly mistake.
Title: Re: Methods Exam 2: Discussion!
Post by: Orb on November 08, 2014, 12:17:49 pm
Actually, I don't think you would - an examiner could just interpret that as you knowing which side of the log you wanted, and actually call it genius instead of a silly mistake.

Wouldn't that be leaving it down to a bit of luck?
Title: Re: Methods Exam 2: Discussion!
Post by: M_BONG on November 08, 2014, 12:20:19 pm
Yeah, I remember assessor report once said you get a mark taken off if you don't put absolute values when integrating into logs, even if you are sure they are positive. :S - you only remove the abs sign once you are certain it's positive - ie. you wouldn't write ln|5|.

But marking scheme changes every year, I guess.
Title: Re: Methods Exam 2: Discussion!
Post by: keltingmeith on November 08, 2014, 12:22:58 pm
Wouldn't that be leaving it down to a bit of luck?

Oh, absolutely! :D But the mark could stay there.

Yeah, I remember assessor report once said you get a mark taken off if you don't put absolute values when integrating into logs, even if you are sure they are positive. :S - you only remove the abs sign once you are certain it's positive - ie. you wouldn't write ln|5|.

But marking scheme changes every year, I guess.

See, I read that, but only interpreted it for the indefinite integral... In fact, if they ask for an antiderivative, you would be more right if you didn't include the modulus signs (although I'm sure VCAA would take off marks if you did that)
Title: Re: Methods Exam 2: Discussion!
Post by: de on November 09, 2014, 10:49:09 am
Hi,
Does anyone else think that MC Question 14 was kind of wrong because it didn't state that the distribution was discrete. You had to assume that Pr(X=5) was 0. Otherwise options were wrong. I find it amazing that it din't state continuity.
Title: Re: Methods Exam 2: Discussion!
Post by: potahto on November 09, 2014, 11:29:00 am
i had no idea what they meant by 'fraction of time'!!!! :( *derp*
do you think i'll lose a mark if i just wrote 4 months???
Title: Re: Methods Exam 2: Discussion!
Post by: de on November 09, 2014, 11:59:52 am
i had no idea what they meant by 'fraction of time'!!!! :( *derp*
do you think i'll lose a mark if i just wrote 4 months???

So sorry, but yes. You didn't answer the question. There will be quite a few people who did the same I suspect.
Title: Re: Methods Exam 2: Discussion!
Post by: Orb on November 09, 2014, 12:03:29 pm
i had no idea what they meant by 'fraction of time'!!!! :( *derp*
do you think i'll lose a mark if i just wrote 4 months???

In scenarios like this, it would be a lot safer if you wrote 4 months = 1/3 in fraction terms or something like that :/
Title: Re: Methods Exam 2: Discussion!
Post by: potahto on November 09, 2014, 12:27:37 pm
So sorry, but yes. You didn't answer the question. There will be quite a few people who did the same I suspect.

aw damn :(
also it should be fine if the generic expression for the tangent wasn't simplified and expressed in the form y=mx+c right? cuz they never asked for it...
Title: Re: Methods Exam 2: Discussion!
Post by: suberman123 on November 09, 2014, 01:48:43 pm
Hi,
For the probability question 4 a (1 mark) and d (2 marks) I mistakenly multiplied by 1000 when converting to millimeter. Other calculations are correct. Does it completely take 2 marks away?
Title: Re: Methods Exam 2: Discussion!
Post by: de on November 09, 2014, 02:42:05 pm
also it should be fine if the generic expression for the tangent wasn't simplified and expressed in the form y=mx+c right? cuz they never asked for it...
Yes that is fine.
Title: Re: Methods Exam 2: Discussion!
Post by: de on November 09, 2014, 02:43:49 pm
Hi,
For the probability question 4 a (1 mark) and d (2 marks) I mistakenly multiplied by 1000 when converting to millimeter. Other calculations are correct. Does it completely take 2 marks away?
I'd say so. Although they ***might*** take the first mark and then say "taken off earlier". I got that in a sac.
Title: Re: Methods Exam 2: Discussion!
Post by: DanielJ on November 09, 2014, 03:08:56 pm
i had no idea what they meant by 'fraction of time'!!!! :( *derp*
do you think i'll lose a mark if i just wrote 4 months???

Atleast you didn't think there were 24 hours in half a day.. did 4/24 =1/6
Title: Re: Methods Exam 2: Discussion!
Post by: Lauren101 on November 11, 2014, 11:33:38 am
Last question was a bit hard.....
Title: Re: Methods Exam 2: Discussion!
Post by: Cici201811 on November 06, 2019, 08:13:24 pm
Can anyone explain why 2017 NHT exam 2 multiple choice question 8 answer is D please?
Title: Re: Methods Exam 2: Discussion!
Post by: PhoenixxFire on November 06, 2019, 08:21:32 pm
Can anyone explain why 2017 NHT exam 2 multiple choice question 8 answer is D please?
Hey!
This thread is from 2014. If you post your question in the current questions thread here I'm sure someone will be able to help :)
Title: Re: Methods Exam 2: Discussion!
Post by: Matthew_Whelan on November 06, 2019, 08:34:06 pm
Can anyone explain why 2017 NHT exam 2 multiple choice question 8 answer is D please?

The average value between 0 and a is a (since the line is horizontal at y=a) and the average value between -a and 0 is 0 (y value ranges from -a to a which has an average of 0).
Add these together and divide by 2 and you get a/2. There may be another method but I think it’s correct since average value is referring to the y axis.
Title: Re: Methods Exam 2: Discussion!
Post by: Cici201811 on November 06, 2019, 09:24:40 pm
The average value between 0 and a is a (since the line is horizontal at y=a) and the average value between -a and 0 is 0 (y value ranges from -a to a which has an average of 0).
Add these together and divide by 2 and you get a/2. There may be another method but I think it’s correct since average value is referring to the y axis.
Thank you very much