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# Edexcel S4 - Friday 24th June 2016 AM

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1. (Original post by NewMedic)
Hypothesis was H0 : mu = 2, H1, mu > 2

Oh thank ****
2. How many marks was the last part of q4? I think it was 2 to say which test is better but could be wrong.
3. (Original post by SB0073)
Weren't you meant to find the mean by adding the two values and dividing by 2. The use one of the bounds eg lower to work out the sample variance by using xbar -t9(0.025) x s/root(n)

And rearrange to get S
Then square S and use the (n-1)S^2 / Chi squared values?

Came out to 76.something and 1034. Something
(Original post by physicsmaths)
Yes. I got ur answers dw!

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Sh*t. I did a 99% confidence interval for the mean...

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4. (Original post by NewMedic)
Hypothesis was H0 : mu = 2, H1, mu > 2

Wasnt it subtraction of mus?

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5. (Original post by Euclidean)
Sh*t. I did a 99% confidence interval for the mean...

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Dw we dont need much in this module! I only needed like 9 ums.

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6. (Original post by physicsmaths)
Dw we dont need much in this module! I only needed like 9 ums.

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How was STEP III fam?

I got you on Facebook now I think

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7. (Original post by physicsmaths)
Dw we dont need much in this module! I only needed like 9 ums.

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Are you doing all the math modules?
8. (Original post by 130398)
Are you doing all the math modules?
Yeh.
9. (Original post by physicsmaths)
Wasnt it subtraction of mus?

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I did D = weight before - weight after (paired t-test)

so mu(d) = 2 in the null hypothesis
10. (Original post by physicsmaths)
Yeh.
D1 last week I did it then checked, realized I did a question completely wrong, and decided it wasn't worth the mental energy and stress to change because 1 modules don't count to A*
11. For the weights one was it H0: Mux=Muy+5 and H1:Mux>Muy+5?

For the First paired t test: H0:Mud=2 and H1:Mud>2
12. (Original post by SB0073)
For the weights one was it H0: Mux=Muy+5 and H1:Mux>Muy+5?

For the First paired t test: H0:Mud=2 and H1:Mud>2
That's exactly what I did : )
13. (Original post by NewMedic)
Same, I also learnt most of it yesterday and I found it pretty easy :0

Question 1: Significant (designer)
Question 2: Not significant for both mean and standard deviation (pigs)
Question 3: 0.3828 for the Type II Error
Question 4: Test A was better
Question 5: Not significant for both F-test variance and two sample t-test (fire brigade)
Question 6: End up with n>1 S is better than Y
Question 7: 76.1, 1034 (I should be right, it asked for the confidence interval for variance instead of mean)
I also finished learning it yesterday, also found it quite easy and agree with all the answers I can remember.
14. Cant remember properly but were the critical regions x<=5 and x>=15?
15. (Original post by SB0073)
Cant remember properly but were the critical regions x<=5 and x>=15?
>=15? For which question?
16. (Original post by coolguy123456)
>=15? For which question?
Oh no did I mess that up? For the hard and soft sweets?
17. (Original post by SB0073)
Cant remember properly but were the critical regions x<=5 and x>=15?
Yep and Type I Error was 0.404 or something close
18. (Original post by NewMedic)
I did D = weight before - weight after (paired t-test)

so mu(d) = 2 in the null hypothesis
Oh kl.

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19. (Original post by SB0073)
Oh no did I mess that up? For the hard and soft sweets?
(Original post by NewMedic)
Yep and Type I Error was 0.404 or something close
I don't think it was 0.404, that's way too big for a type 1 error, and SB007, do you mean 15 for part c? I used p=0.25 and did P(X>=6) (I think
Can't quite remember)
20. (Original post by coolguy123456)
I don't think it was 0.404, that's way too big for a type 1 error, and SB007, do you mean 15 for part c? I used p=0.25 and did P(X>=6) (I think
Can't quite remember)
My mistake, I meant 0.0404 :P

I thought part C was P(6 <= X <= 14 | p=0.25)? Dunno

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