Edexcel S4 - Friday 24th June 2016 AM

Hi Sean,

I understand you did S4. I have a question about the paper if you dont mind answering. In the markscheme, whenever we do t distribution it has the +_ (minus sign below plus sign). Do we have to put this is in the answer, or is it saying you can have plus or minus.

Thanks

veconomcis

I'm not 100% sure what you mean, but the t distribution is symmetrical like the normal distribution, so just like if you had the sample mean xbar from a normally distributed set of points and wanted the 95% interval, you would do xbar +/- 1.96sd to find the confidence interval.Similarly, with a t distribution you'd do xbar +/- t(degrees of freedom, significance level = alpha*s or s/rootn depending on what the interval is for.

june 06 ms has an error i'm pretty sure

Where
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Is there anyone who could help me with question 7b?

Oops - didn't see this, sorry! Did you still need hints?

Yes, would be good

I still haven't learnt past the first chapter of S4 :/ Is there any part of the module that's especially tricky (i.e. I should probably look at soon)?

I still haven't learnt past the first chapter of S4 :/ Is there any part of the module that's especially tricky (i.e. I should probably look at soon)?

How does this exam compare to S1,S2 and more specifically, S3?

S1 is different in terms of content to S2, S3 and S4. In my opinion, S3 is more difficult than S4, and S4 is slightly harder than S2, and S1.. well, its difficulty is different to the difficulty of the other S units.

No harder than S2 or S3. It's such an easy unit really chapter one is type 1 and type 2 errors which really is just a fancy way for asking for a certain probability nothing too hard here.

The rest is just hypothesis testing with different distributions the same stuff you've been doing in S2&3


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