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Ocr mei statistics 1 exam thread (24/05/13)

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Reply 360

jonny7bell

Original post by krishkmistry

Did we all accept h0 for the hypothesis test ?

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I did. I got P(x>=13)=0.1316>0.05 so reject H0. Did you get that or did you do the critical region method?

Reply 361

juniorx

Original post by Mahinder

so for question 3 i did

x-b(50, 0.1)
p(x=5) = 50c5 x0.1^5 x 0.9^45

ii)
x-b(20,0.1)
p(x>=1)=1-p(x<=0) = 0.874

then it was expectation question i think so it was 48 x 0.874

i wrote this bit and the answer for the first part but do you definetly lose marks if you don't write: 50c5 x0.1^5 x 0.9^45

Reply 362

jonny7bell

Original post by juniorx

i wrote this bit and the answer for the first part but do you definetly lose marks if you don't write: 50c5 x0.1^5 x 0.9^45

It was 3 marks, so you will probably get a mark for the binomial part, a mark for the 50c5... part and a mark for the answer.
So you will probably lose a mark.

Reply 363

Mahinder

roman that is question 2ii but for question 2i u had to times by 3! because there is 6 ways of getting the outcomes

there is not just 3 ways of get them

Reply 364

juniorx

Original post by jonny7bell

It was 3 marks, so you will probably get a mark for the binomial part, a mark for the 50c5... part and a mark for the answer.
So you will probably lose a mark.

oh great an easy mark lost :angry:

Reply 365

Mathsz0r

Someone get the paper up, and I'll do an unofficial MS.

Reply 366

Mr.yellowey

There is insufficient evidence to reject ho (accept ho)

Reply 367

juniorx

Original post by Mahinder

roman that is question 2ii but for question 2i u had to times by 3! because there is 6 ways of getting the outcomes

there is not just 3 ways of get them

what was this question about?

Reply 368

jonny7bell

What did people get for 7 iii)? I got 0.8247 but I really wasn't sure as my numerator was P(hitting at least 1 bulls eye, and hitting 1 bullseye) so I just used my answer for part B which was 0.1548.

Reply 369

RomanMarkOliver

Original post by Mahinder

roman that is question 2ii but for question 2i u had to times by 3! because there is 6 ways of getting the outcomes

there is not just 3 ways of get them

W W M
W M W
M W W

surely these are the only ways it can happen?

correct me if i'm wrong lol, could well be.

Reply 370

Mahinder

well i think overall i am now going to get 53/72 which is a b? right? and that is wat i wanted damn happy now :smile:

all i can do is pray the grade boundaries are low to confirm my b

Reply 371

lorobolorolo

Original post by juniorx

what was this question about?

The one about the 5 men and 5 women are doing some competition and what is the probability of 2 women and 1man winning :smile:

Reply 372

Mahinder

juniorx id say u lose a mark for not showing ur calculations unless u mentioned u used the tables in the formual booklet

Reply 373

hoa123

Original post by princess_96

for the hypothesis testing: as 13/20 guessed correctly

P(X≥13) = 1-P(X≤12) =0.13.. (something)

0.13>sig level

so accept null hypothesis

should be like that^ :/

thank god someone understands how it works. Far too many people not understanding that if it's greater than 0.05 then we accept H0

Reply 374

Mahinder

yh ur right roman soz lol

Reply 375

lorobolorolo

For the lasr part of question 6, how did people get 9 or 8 boys had a lower weight than the highest female. I got 12 males cos I read it off at 4.34 which was the highest weight of the female. Could someone please tell me what I did wrong :confused: