Well, for me, other than that mosquitoe question, there's a 0.95 probability (irony) that the others will be fine. it's just math calculations. well everyone what were the answers you guys wrote for that mosquitoe thing? the d part i think i got 32 days. help?

Reply 384

yaboy

Original post by StrawHat_Shifaz

Well, for me, other than that mosquitoe question, there's a 0.95 probability (irony) that the others will be fine. it's just math calculations. well everyone what were the answers you guys wrote for that mosquitoe thing? the d part i think i got 32 days. help?

yeh that question i completely fluffed, i got t=1 somehow, but what did you get for N when it asked for the number of trials?

Reply 385

Lili94

what did you guys get for the last part of question 4 where it asked to find 'a' ?

Reply 386

StrawHat_Shifaz

Original post by yaboy

yeh that question i completely fluffed, i got t=1 somehow, but what did you get for N when it asked for the number of trials?

number of trials? there was a question like that? O.o which one are you talking about?

Reply 387

yaboy

Original post by Lili94

what did you guys get for the last part of question 4 where it asked to find 'a' ?

6/5 but no idea tbh to check i subbed it into 4a(1/3a)-a(1/3a) and got 1 so i thought it was right

Reply 388

yaboy

Original post by StrawHat_Shifaz

number of trials? there was a question like that? O.o which one are you talking about?

it said the probability of it was 0.45 and we had to find the number of trials for which p(x=0) < 1%

Reply 389

StrawHat_Shifaz

Original post by Lili94

what did you guys get for the last part of question 4 where it asked to find 'a' ?

i guess it was 8/3 or something similar. sorry for poor memories. but when i used the answer with the probability of Y, it matched with the probability of X. so its supposed to be correct right? O.o

Reply 390

Shaphvarn

Original post by yaboy

it said the probability of it was 0.45 and we had to find the number of trials for which p(x=0) < 1%

I think it was 8 or something. Question about mosquitos took away 3 of my marks :| Prolly did. June, here I come.

Reply 391

StrawHat_Shifaz

Original post by yaboy

it said the probability of it was 0.45 and we had to find the number of trials for which p(x=0) < 1%

oh i divided 1% into 2. and found the critical region and gave both values. i think its x13 (or 12 i think). what about you?

Reply 392

yaboy

Original post by Shaphvarn

I think it was 8 or something. Question about mosquitos took away 3 of my marks :| Prolly did. June, here I come.

hmm i got 8, for the value of p for the bionomial question i ended up with p=0.8,0.2 but damn them grade boundaries better be 42 to get an A

Original post by StrawHat_Shifaz

oh i divided 1% into 2. and found the critical region and gave both values. i think its x13 (or 12 i think). what about you?

it asked for the number of trials not the critical region :/?

(edited 11 years ago)

Reply 393

Lili94

did any of you know how to do the last part of the mosquito one? my mind completely blanked there...

Reply 394

StrawHat_Shifaz

Original post by yaboy

hmm i got 8, for the value of p for the bionomial question i ended up with p=0.8,0.2 but damn them grade boundaries better be 42 to get an A it asked for the number of trials not the critical region :/?

oh sorry maybe i forgot. i meant critical region for that Mrs. george's voting question if that's what you meant?

Reply 395

StrawHat_Shifaz

Original post by Lili94

did any of you know how to do the last part of the mosquito one? my mind completely blanked there...

i think you shoule equate that whole formula to 0.05. Then you get a quadratic. complete the square. you get a negative answer and a positive one. positive one's 32 and thats what my answer was. ITS MY ANSWER BTW. the examiner might think otherwise! *bitch please laugh*

Reply 396

yaboy

Original post by StrawHat_Shifaz

oh sorry maybe i forgot. i meant critical region for that Mrs. george's voting question if that's what you meant?

I did a one tailed test and got CR<4 and H0 wasnt rejected. It seems logical considering the expected value would be 9 and 5 is less then that but everytime i needed to do a two tailed test on a past paper the question said do a two tailed test but yeh sometimes they want both im not a 100% sure though

Reply 397

CTom

Original post by Lili94

what did you guys get for the last part of question 4 where it asked to find 'a' ?

I got either 4/3 or 2 (chose the 2 method in the end), but was at end of exam where i'd come back to finish the question and my brain was already fried so not sure =p.

Reply 398

BobLoblawLawBlog

16

I got n=8 for the number of trials, 32.4 for the number of days (I didn't round it at all - will I lose a mark for this?), and a=8/9.
That mosquito question was the biggest load of crap I have ever done.

Reply 399

yaboy

ehhh better hope them working out marks help me

S2 18th January 2013

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