ATAR Notes: Forum
Archived Discussion => Mathematics => 2011 => End-of-year exams => Exam Discussion => Victoria => Mathematical Methods CAS => Topic started by: peter135 on November 15, 2011, 07:17:41 pm
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My TI-Nspire freeze for extended response Q2 and Q4. Do you have the same problem?
Last year, Herald Sun said it happened for Casio and marks were changed:
http://www.heraldsun.com.au/ipad/answer ... 5963505851
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I used a TI-89 and it didn't freeze.
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Plus, your link doesn't work.
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This is the link again:
http://www.heraldsun.com.au/ipad/answers-just-didnt-add-up/story-fn6bfkm6-1225963505851
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I remember my cas stalling for about a minute but it did eventually spit out an answer. I think the problem last year was that their calculator didnt return anything.
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The cas didnt freeze for me? And i use the tinspire.
What part of the question? Like what did you have to calculate?
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It happened if you tried to integrate through the hybrid function to solve for something
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Well, you can't integrate a hybrid. You have to integrate two separate equations, each with different domains.
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For the last question, my problem is when I was trying to solve for the value of x when dy/dx equals to zero for Q4e, the CAS froze and crashed. Same thing happened when I tried to find the value of k using the solve mode (Menu 3,1) for Q4f. Is that how you did?
For question 2b, I didn't integrate the hybrid function. I anti differentiated two separate equations, but my CAS was not responding and I had to reset it. For Q 2cii, I was trying to find the value of a (which is the upper bound of the integral) by using the solve mode once again, but my CAS crashed after awhile. I cleared all my variables before the exam, so i clearly have no idea what went wrong. What commands did you use?
thx!
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mine froze 3 times - had to take the batteries out 3 times too...
it also froze for me on the MC question where you had to work out what w was greater than / less than for something, and once of them was 7 < or something and I subbed in 8 to check, and yay frozen. ehhhh
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Yeah, mine stalled a bit, but eventually gave an answer.
What did they do last year about the marks?
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Well they might not do anything about it cos it didnt really affect everyone. But it does suck when that happens! Ask your teacher? Or email vcaa or something...
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i think i do remember mine freezing
it wasn't hard to get around it though iirc
i just remembered thushan's words about making life easier for your CAS (although q4 i screwed the last two parts)
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Well, unless everyone's calculators were frozen for a particular question, then VCAA can't award you any additional marks. Simply because there is no proof that your calculator did freeze during the exam (although it it did, that would suck!).
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Herald Sun (last year):
THOUSANDS of students have had their marks changed on a VCE maths exam.
Several schools complained that students using a certain approved calculator had problems solving two questions on the second maths methods paper held on November 8.
A teacher and exam marker said yesterday that students with the Casio Classpad calculator got "no solution" when tackling the questions.
"It caused a lot of students a great deal of stress. They came out in tears," said the teacher, who wished to remain anonymous.
"They were effectively locked out of the question, costing them valuable time and potentially six marks on an 80-mark paper."
VCE exam results will be released on December 13.
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No freeze here with the NSpire CAS (OS 3.something)
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My TI-Nspire has OS version: 3.1.0.392 (I suspect this caused the frozen). It was upgraded to this version about 1 month ago.
For those who had the calculator frozen, is the OS version same as yours?
For those who did not have the problem, can you tell me your calculator's OS version?
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I didnt have a problem at all and i have the newest OS. Whenever you put stuff into yuor calculator always put it in a simpler form especiallly if its some massive fraction and you want to solve for x and its inside a surd or something in the numerator... just multply across the denominator so its 0 then square both sides. So you just put in the thing inside the surd=0 and solve.
But yeah not sure what happened to your calc...
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Sucks to be you!