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# Official Edexcel S3 thread Wednesday 20 May 2015 Morning [6691] watch

1. (Original post by STATER)
Sigmas constant isnt it?
Anyways I got the same answer.
Yeah sigma is constant! but to obtain sigma you need to use the 2 simultaneous equations as shown in the post earlier this page! and in that i missed a dividing by 10 part out. So how many marks will that cost me lol??
2. For confidence interval did it give us the mean of the second sample
For some reason I worked out the mean of the sample in the first confidence interval and used that one which I think was 4.88
Worked out sigma obviously
Reckon 2 marks lost or?
3. (Original post by 13 1 20 8 42)
For confidence interval did it give us the mean of the second sample
For some reason I worked out the mean of the sample in the first confidence interval and used that one which I think was 4.88
Worked out sigma obviously
Reckon 2 marks lost or?
yeah it gave you a separate mean, i reckon 2 marks lost
4. A* 69
a 65
5. (Original post by dhrumitvora)
A* 69
a 65
no
6. ok
(Original post by STATER)
no
7. (Original post by dhrumitvora)
A* 69
a 65
No way .. Way too high..... Perhaps gap year for me since I can't even meet the offer

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8. (Original post by DCMed96)
No way .. Way too high..... Perhaps gap year for me since I can't even meet the offer

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69 cz most of us lost 6 marks for 5d otherwise even u have seen dat boundaries dont go so low max it can go low i think myt be 68
9. Any unofficial mark scheme available?
10. I understand that in s3 method marks are important and answer mark is not enough, but is this the case for all papers? If you get an answer right in c3 paper do you get all the marks?
11. (Original post by Kelani)
Any unofficial mark scheme available?
pg 28
12. For 1a i said to use systematic sampling and explained how to do it taking random numbers etc
Would I get any marks?
13. Boundaries have shifted between 69 and 68 over past years
I reckon it might go down to 67 but it's unlikely to be particularly low
Then again FP3 last year was said to be super hard and accordingly the a* boundary dropped to 63 so FM boundaries are perhaps more variable than we may assume
14. (Original post by dhrumitvora)
A* 69
a 65
A 61 a* 68
15. did anyone get a positive value for rs?? i think i got positive 0.6 but i ranked the books from least amount of pages to most. made h0: rs = 0 and h1: rs>0
16. (Original post by burger97)
did anyone get a positive value for rs?? i think i got positive 0.6 but i ranked the books from least amount of pages to most. made h0: rs = 0 and h1: rs>0
Yes, I got a postive value but I don't think it matters
17. (Original post by burger97)
did anyone get a positive value for rs?? i think i got positive 0.6 but i ranked the books from least amount of pages to most. made h0: rs = 0 and h1: rs>0
https://869d950bf149eefd5cd2652b4001...%20Edexcel.pdf

See the notes of 2a)
18. q4 can you use a 5% sig level and reject h0???
19. (Original post by Gome44)
Yes, I got a postive value but I don't think it matters
I really hope so, cant deal with more mistakes. I think im already losing 11 marks.
20. (Original post by mmms95)
q4 can you use a 5% sig level and reject h0???
? Why would you reject Ho

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