Edexcel S3 - Wednesday 25th May AM 2016

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I'm pretty sure the best wording is along the lines of "as the samples are large, we are able to assume that the sample means are distributed approximately normally".

We also have to assume that population variance is equal to the sample variance. S squared equals to sigma squared

Reply 1181

Music With Rocks

F@#K!!!!!!!!!!!
I did binomial instead of Poisson!!!

For the airport question for the last two parts the (3) marker and the (6) marker I misread the question and did a binomial rather than poisson

Will I be able to get any marks!? I know I lost the (3) but will I get some of the (6)?

I am so pissed off at myself, I revised so hard for this exam and threw away my shot at an A* and my uni offer in the stupidest way possible

Reply 1182

SB0073

Original post by JacobTan

why 44? i got 27. anyone remember what the question was?

I think something like SD 2% Calculate minimum number of n for p(|Xbar-Mu|<0.5)>or equal to 0.9

Reply 1183

SB0073

Original post by anndz3007

2, 5.61
3 rs= 0.75
4, a) .7784 b).0107
5 1.95
Unbias mean 26.5, variance 12.7
As long as i remember this is what i did

Those all ring a bell Mean was like 26.45 right?
Wait what was 1.95 for?

(edited 7 years ago)

Reply 1184

260498

Does anyone remember the marks for each question?

Posted from TSR Mobile

Reply 1185

economicss

For question 2, did people get 4.604 is less than 4.605 for the conclusion?

Reply 1186

Armpits

Didn't get 44 for the last one, must've made a mistake, but the rest appeared to be fine.

Reply 1187

justalawyer1998

2) association
Last question: n = 44

I remember a 12.07 and a 0.0107 and a 0.7784 somewhere too

Posted from TSR Mobile

Reply 1188

ninjass

Binomial test statistic 4.10
Poissom test statistic 14.65
R = 26.07
S =14.65

Sound familiar

Reply 1189

username1914251

Original post by SB0073

Thanks also Did you get the doctors claim was supported by data,

B(4,0.3) was suitable
Poisson dist was not suitable

For SRCC Sunglasses and ice-cream positively correlated
Whereas PMCC suggests it not positively correlated
For the last part of that Q Non-linear positive correlation

I got that for Binomial and Poisson, yes. Did you get

\lambda = 1.8

for poisson?

That question about the sunglasses is the one I am not sure on, yours sounds correct and is similar to what I put however I feel something more in context is what they were looking for?

Reply 1190

username1162972

Original post by Euclidean

Anyone find it hard for time?

Posted from TSR Mobile

Yeh ran outta time dropped like 10 marks or more.

Reply 1191

Apolexian

Original post by Mav1

I got that for Binomial and Poisson, yes. Did you get

\lambda = 1.8

for poisson?

That question about the sunglasses is the one I am not sure on, yours sounds correct and is similar to what I put however I feel something more in context is what they were looking for?

ye it was 1.8

Reply 1192

Armpits

Original post by SB0073

I think something like SD 2% Calculate minimum number of n for p(|Xbar-Mu|<0.5)>or equal to 0.9

Did you rearrange 0.5/2rootn = 1.9/2 ?

Reply 1193

JoshC98

For the two mark assumption question, I put sample variance = population variance for both exercise and not exercising, I didn't think clt analysis was applicable since the samples weren't 50 or greater?

Reply 1194

Armpits

Original post by Nikhilm

2) association
Last question: n = 44

I remember a 12.07 and a 0.0107 and a 0.7784 somewhere too

Posted from TSR Mobile

For the last one did you rearrange 0.5/2rootn = 1.9/2 ?

Reply 1195

SB0073

Original post by Mav1

I got that for Binomial and Poisson, yes. Did you get

\lambda = 1.8

for poisson?

That question about the sunglasses is the one I am not sure on, yours sounds correct and is similar to what I put however I feel something more in context is what they were looking for?