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# OCR MEI Maths (S1) watch

1. hi everyone,
just wondring wot everyone thought of the exam 2day. Personally thought it was a bit of a bugger, guessed at the method of a few things but overall OK i hope!
2. (Original post by JML161)
hi everyone,
just wondring wot everyone thought of the exam 2day. Personally thought it was a bit of a bugger, guessed at the method of a few things but overall OK i hope!
S1 was easy, I missed out some of the last question (hypothesis testing) and also another earlier question.
Then we did S2 straight after S1, which I know I failed!
3. I'm not really a fan of the exam post mortem however did anyone manage the question in S1 on 7 passes in the sport question. It was part (ii) and was along the lines of A,B and S... Independant of each other...find the probability that they pass 7 games. Did you multiply each prob by 6?
I got 0.28 something i think.

Also, there was a strange question on S2 at the end of the normal distribution question on finding P(A) and P(B) or both when independant.

It was do-able with odd questions in it.
4. (Original post by natsy)
I'm not really a fan of the exam post mortem however did anyone manage the question in S1 on 7 passes in the sport question. It was part (ii) and was along the lines of A,B and S... Independant of each other...find the probability that they pass 7 games. Did you multiply each prob by 6?
I got 0.28 something i think.

Also, there was a strange question on S2 at the end of the normal distribution question on finding P(A) and P(B) or both when independant.

It was do-able with odd questions in it.
Well I can certainly say you did better then me in S2, because I missed half of that question along with half of the first question.

Can you tell me: How did you do the hypothesis test for 1st question?
and for the last question, what did you write about why p(x=3) = 0 ?
5. (Original post by Vijay1)
Well I can certainly say you did better then me in S2, because I missed half of that question along with half of the first question.

Can you tell me: How did you do the hypothesis test for 1st question?
and for the last question, what did you write about why p(x=3) = 0 ?
For the hypothesis test I said the null hypothesis was they didnt agree and the alternative hypothesis was they did agree. The critical value was smaller than the rank coefficient, so I said they agreed.
I didn't put anything for P(X = 3) = 0, infact I didnt like that last question at all. The last part was badly written. It said about getting a question right in a round raises the prize TO £1000, not BY £1000, so this would mean it resets to £100 at the beginning of each round, although it didn't say this.
The rest of the paper was just the usual crap, not that bad, although I probably lost a lot of marks on those questions "explain why....". Could have been better really. I couldn't figure out a probability argument for p (X=4) though!
6. For P(X=3) = 0 I put that if you got three locations correctly, there was only one option left to choose for the 4th location, which must be the correct answer. Therefore you get all 4 right. I accepted the alternative hypothesis too! For the probablity argument I just did a quarter x third x half x one, the product of the probability of guessing the locations correct. I'm not sure about that last question, it was weird.
7. Did you do MEI? I don't remember the last question being with prize money. There were only 4 questions and I thought the last one was a chi squared hypo test!

*panic attack*

???

I'm so confused. Did i miss out a WHOLE question?
8. Dont think so, I did S1 and the last question was about biased dice (a hypothesis test about whether the dice is biased against and for 6). I thought overall it was pretty easy, I hope I got an A in this so that I can get at least an overall B in Maths..... BTW, one question really stumped me, it was the one about finding the probability for 3 people passing 7 matches, the tree diagram question....
9. There was two MEI papers for S1 today. One was 2000 spec and one was 2004 spec. I did the 2000 spec one which has 4 questions on it
10. (Original post by Posie)
For P(X=3) = 0 I put that if you got three locations correctly, there was only one option left to choose for the 4th location, which must be the correct answer. Therefore you get all 4 right. I accepted the alternative hypothesis too! For the probablity argument I just did a quarter x third x half x one, the product of the probability of guessing the locations correct. I'm not sure about that last question, it was weird.
Ahhh it seems so easy now. I misunderstood the question. I remember now it said about matching the names to the places, for some reason I had it in my head that there was a probability of 1/2 of getting each one right Meh who cares, I'm getting an A either way
11. (Original post by Tidasquall)
Dont think so, I did S1 and the last question was about biased dice (a hypothesis test about whether the dice is biased against and for 6). I thought overall it was pretty easy, I hope I got an A in this so that I can get at least an overall B in Maths..... BTW, one question really stumped me, it was the one about finding the probability for 3 people passing 7 matches, the tree diagram question....

i'm not entirely sure, and i could be very very wrong but from what i remember this is what i did for that q...

{[P(pass3) x P(pass3) x P(pass1)] + [P(pass3) x P(pass2) x P(pass2)]} x 3!
think it gave me about 0.28ish but again, cant be sure.

btw,for one of the q's on sect A did ny1 get a stupidly small probability, think it was the last part of the exam questions question (if that makes sense!).
12. (Original post by Vijay1)
Well I can certainly say you did better then me in S2, because I missed half of that question along with half of the first question.

Can you tell me: How did you do the hypothesis test for 1st question?
and for the last question, what did you write about why p(x=3) = 0 ?
apparently it was a one tail test with
H0=0
H1>0 (i.e. positive correlation...means that the judges are in agreement)

Unfortunately i did a two tail test. Oh dear.

p(x=3)=0 if you get 3 of the qurestions right then you have to get the 4 th right as there is only one place name and picture left.

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