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# Edexcel S3 - Wednesday 25th May AM 2016 watch

1. (Original post by cjlh)
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
2. [email protected]#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
3. (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
4. (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?
5. Does anyone remember the marks for each question?

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6. For question 2, did people get 4.604 is less than 4.605 for the conclusion?
7. Didn't get 44 for the last one, must've made a mistake, but the rest appeared to be fine.
8. 2) association
Last question: n = 44

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

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

Sound familiar
10. (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 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?
11. (Original post by Euclidean)
Anyone find it hard for time?

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Yeh ran outta time dropped like 10 marks or more.
12. (Original post by Mav1)
I got that for Binomial and Poisson, yes. Did you get 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
13. (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 ?
14. 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?
15. (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 ?
16. (Original post by Mav1)
I got that for Binomial and Poisson, yes. Did you get 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?
Thats what I roughly wrote! Yea 1.8 :P
17. (Original post by physicsmaths)
Yeh ran outta time dropped like 10 marks or more.
Same !
18. What was the 1.95 for?
19. (Original post by JacobTan)
why 44? i got 27. anyone remember what the question was?
I got 27 too!!
20. (Original post by SB0073)
Those all ring a bell Mean was like 26.45 right?
Wait what was 1.95 for?
I got something like 26.45 as well, and I can't remember what's the question of 1.95 neither...

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