ATAR Notes: Forum
VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: happyhappyland on September 05, 2010, 10:00:13 pm
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I just did 2008 Exam under timed conditions and got
27/40 = 54/80 for exam one equates to a B+
63/80 = 126/160 for exam two that is around a mid A
My sacs would been a mid A aswell. What study score would I have gotten?
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35 - 36
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27/40 would have just scraped B+ and 63/80 is the highest A
So according to the stats ('08) it would equate to approximately:
EXAM 1 = 11 x 0.51 (you're percentile) = 5.61/11
EXAM 2 = 22 x 0.885 = 19.47
SAC = 17 x 0.73 = 12.41
Total = 5.61 + 19.47 + 12.41
= 37.49 SS
that would be my estimation but it could vary from 35~38
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27/40 would have just scraped B+ and 63/80 is the highest A
So according to the stats ('08) it would equate to approximately:
EXAM 1 = 11 x 0.51 (you're percentile) = 5.61/11
EXAM 2 = 22 x 0.885 = 19.47
SAC = 17 x 0.73 = 12.41
Total = 5.61 + 19.47 + 12.41
= 37.49 SS
that would be my estimation but it could vary from 35~38
Thats some pro stuff there.. did you work out my percentile using normalcdf with the mean and sd on the statistics page?
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Nah no methodsy stuff xD just looked at the table they give on the stats page and added the total % of people who would have done better then 27/40 and multiplied it with 22%(GA2) x 50(ss). Did similar thing to the other 2 estimates
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losing 13 marks on a methods exam 1 is unforgivable :P
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decided to give this exam a go :)
exam 1- 40/40
exam 2- 77/80
given im ranked sumwhere in the top 10 or 15ish of a really strong cohort of 150 or so kids, wat kind of ss would i get?
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47+
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decided to give this exam a go :)
exam 1- 40/40
exam 2- 77/80
given im ranked sumwhere in the top 10 or 15ish of a really strong cohort of 150 or so kids, wat kind of ss would i get?
37
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decided to give this exam a go :)
exam 1- 40/40
exam 2- 77/80
given im ranked sumwhere in the top 10 or 15ish of a really strong cohort of 150 or so kids, wat kind of ss would i get?
37
45+
37? Lolwut
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decided to give this exam a go :)
exam 1- 40/40
exam 2- 77/80
given im ranked sumwhere in the top 10 or 15ish of a really strong cohort of 150 or so kids, wat kind of ss would i get?
According to 2008, you would get 50. (I was told dcc lost 3 marks and got 50, but I know for sure losing 2 marks yielded a 49 my friend got 49)
According to 2009, you would get 48. (I lost 3 marks and got 48, my friend lost 2 and got 49)
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sweet, thanks :)
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@avo & happyhappyland
Have a look here: http://vcenotes.com/forum/index.php/topic,6688.0.html
You might be interested in the maths going on there.
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@avo & happyhappyland
Have a look here: http://vcenotes.com/forum/index.php/topic,6688.0.html
You might be interested in the maths going on there.
I never seemed to have used that excel document properly, but for me Ive worked out somethign with probability Ive learnt from methods...
Say for an easier subject like Chemistry
Get a total out of 50 so
33% of 50 for each thus each GA is worth ~16.5 marks.
You enter ur predicted score into your calc using normalCDF with say 0 to [given score] with the given SD and Mean. X that number by 16.5 and ull get something over 50. But since 40/50 isnt top 10% but top 8% I used basic chemistry-like ratios... Heres an example.
Chemistry 2009 Data
Exam 1: 114/146 GA1
Thus
Lower: 0
Upper: 114
SD: 30.1
Mean: 73.8
NormalCDF= 0.902044856
GA2
190/200
Lower: 0
Higher: 190
SD:31.1
Mean: 151.9
NormalCDF: 0.8897270136
GA2:
140/152
Lower: 0
Upper: 140
SD:33.3
Mean: 88.8
NormalCDF = 0.9340887544
add up all the percentages and average it 0.908620208
then if 40ss=0.92 (top 8%)
"x"ss = 0.908620208
39.5 ss. But you see its not exactly THAT accurate. . Only if the Mean and SD is provided for the actual STUDY SCORE itself. In which in MAO's post you stated
Mean=30 SD = 7
so if i did invNormCDF "L" (left) and the prob was .9086 with SD=7 Mean=30
I get 39.3 But remember the stats I used was
GA1: Lowest A+
GA2: Mid A+ (but mid A+ for sacs is around top 12%)
GA3 : Low-mid A+
So even with 3A+ you get around a 39-40 if one of your A+ is the lowest.
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What SS would this equate to? (2006)
Exam1-39
Exam2-78
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What if I have extremely low SAC marks? failed 2 SACs, one being an application task worth 13% of total study score supposedly and the other a small 3%-er but lowering my ranking nonetheless. I failed the first semester and outranked by about 9 people. I've kinda shot up getting top mark in the most recent SAC and aiming to do the same for the next.
Atm I see myself getting the highest result in the exam of my cohort, realistically a B+ for both or A+ god willing. What's the best I can hope for?
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Can someone predict my study score. I got 73% for Unit 3 and if I get like 83% for Unit 4 and around 85% for each exam what study score would i get around?