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# Edexcel S3 - Wednesday 25th May AM 2016 watch

1. (Original post by economicss)
Sorry, it shouldn't be, is from solutions bank It's exercise 3E question 13b on page 44 of the textbook Thanks
This is. The working I was trying to show
2. (Original post by economicss)

This is. The working I was trying to show
Zacken
3. (Original post by economicss)
Zacken
So you got , this means your confidence interval is the area between and , no?
4. (Original post by Zacken)
So you got , this means your confidence interval is the area between and , no?
Ah yes, should have used the diagram!! Thanks!
5. (Original post by economicss)
Ah yes, should have used the diagram!! Thanks!
Nice! Glad that little hint helped. :-)
6. (Original post by Zacken)
Nice! Glad that little hint helped. :-)
You're a lifesaver!
7. (Original post by economicss)
You're a lifesaver!
No problem. Do you want to tag me on that FP2 thingy you were asking me about earlier so I can have a look at it (not right now because I'm not home) but when I'm back?
8. (Original post by Zacken)
No problem. Do you want to tag me on that FP2 thingy you were asking me about earlier so I can have a look at it (not right now because I'm not home) but when I'm back?
Yeah that would be great, thank you
9. (Original post by economicss)
Yeah that would be great, thank you
Thanks!
10. Hi please could someone explain question 2b of the june 2014 paper, why is it we divide by 2 squared for the variance rather than 2? Thanks :-)
11. (Original post by economicss)
Hi please could someone explain question 2b of the june 2014 paper, why is it we divide by 2 squared for the variance rather than 2? Thanks :-)
12. (Original post by economicss)
Hi please could someone explain question 2b of the june 2014 paper, why is it we divide by 2 squared for the variance rather than 2? Thanks :-)
I haven't seen the question because I'm saving that paper as a mock but are you aware (from S1 and S3) that and so that ?
13. (Original post by economicss)
Hi please could someone explain question 2b of the june 2014 paper, why is it we divide by 2 squared for the variance rather than 2? Thanks :-)
I've actually done this question on a mock - you should follow techniques learnt in S1 that Zacken mentioned and it's simple from there.
Spoiler:
Show
14. (Original post by aymanzayedmannan)
I've actually done this question on a mock - you should follow techniques learnt in S1 that Zacken mentioned and it's simple from there.
Spoiler:
Show
Thanks so much, should have taken the 1/2 outside of it! Please could you explain how question 6c on this paper https://869d950bf149eefd5cd2652b4001...%20Edexcel.pdf is done using confidence intervals, as I understand the normal distribution method but not too sure how it can be solved using confidence intervals? Thanks
15. Hi, does anyone know please whether we could be asked to do a test like that one in question 4i here? From an OCR paper https://f1f559d498e385d34687bce0088e...20S3%20OCR.pdf
16. (Original post by economicss)
Hi, does anyone know please whether we could be asked to do a test like that one in question 4i here? From an OCR paper https://f1f559d498e385d34687bce0088e...20S3%20OCR.pdf
I think this is out of spec. I'm not certain though.
17. (Original post by economicss)
Hi, does anyone know please whether we could be asked to do a test like that one in question 4i here? From an OCR paper
Nope, the only continuous distribution we work with is the normal and uniform, not random PDF's like those. You could, however be given a continuous uniform PDF and asked to find the expected frequency though, it's not really that different.
18. Does anyone know if there's any extra resources available for this module, like practice papers? Thanks
19. (Original post by economicss)
Does anyone know if there's any extra resources available for this module, like practice papers? Thanks
Have you done the book's review exercises?
20. (Original post by aymanzayedmannan)
Have you done the book's review exercises?
Yeah

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