Edexcel S3 - Wednesday 25th May AM 2016

For the pmcc/spearman comparison, could you say that there is association but not linear?

6 marks

I'm pretty sure this is the whole point of the question? Although I'd have said there is evidence of a positive correlation but the relationship is not necessarily linear

Thanks. 6 marks was for 6c, right? Do you remember, by any chance, how many marks was 6b, which was to calculate r and s? Because that's were I made a mistake with lambda

For question 2, did you have to do the expected frequencies to 2 decimal places or was that just for question 6? I left mine as fractions so how many marks would I lose since I did everything else correctly?

My answers - I thought t was fairly standard

1a) More representative, individual strata estimates availiable
1b) random process, no interviewer bias

2) 5.61 and I think you rejected

3a) When the data isn't bivariate noral
b) 0.75 and I think you rejected
You accepted the pmcc question
e) You HAD TO say about ranks - days where sales of ice cream ranked highly, ranked highly for sunglasses

4a) 0.7794
b) 760,302.25
c) 0.0107

5a) 1.95 and you rejected
b) Var of sample = var of population. Samples are independent of each other. CANT MENTION CLT - as its not an assumption, it's a thorem
c) tricky - 12.7

6a) Test statistic was 4.1 and you accepted
b) r= 26.78 s= 16.07
c) Test statistic was 14.65 you reject

7a) 19.15%,19.85%
b) Paul shoud tell them to lover stated weight
c) n=44

Who agrees?

I think it was 8, 3, 6

how many marks is that binomial question (part a)?

Cheers. Oh well, I don't think I'll get more than 3 marks out of those 9.

For the fat fighters question does it matter if you didn't write percentages for the confidence interval?

please someone tells me it does not matter... Life wiould then be much easier

Just printed off loads of papers, you doing all textbook questions and then papers or just smashing through papers?

Yeah I also didn't include percentage marks, fingers crossed it didn't matter. I imagine only -1 mark if it did though?

Yeah I also didn't include percentage marks, fingers crossed it didn't matter. I imagine only -1 mark if it did though?