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# AQA A2 Mathematics MS2B Statistics 2B - 21st June 2016 watch

1. (Original post by lol ok but)
What values did people get for the chi squared? Did you reject or accept H0?
Accept
2. This is what I remember and it MAY NOT BE RIGHT

1(a) 0,7029
1(b) 0.669
1(c) 0.1327
1(d) 0.144
1(e) 0.462 (should be 0.622)

2. Mean = ? s2 = ?

3(a) 0.350
3(b) 0.1575
3(c) Var(x) = 2.7736
3(d) Poisson cannot have an upper limit, people don't borrow books at a constant average rate
3(e)(i) 30.8p
3(e)(ii) 5.27p

4
(a) k = 10
(b) P = 0.70
(c) E(X) = 0.05
(d) Integrate, ans = 1/300
(e) SD(X) = 0.0289

5(a) Test statistic = 2.3386, CV = 2.706 so accept null
5(b) comment

6(a) Test statistic = -2.20794, reject null
6(b)(i) 16.7 +- 1.80
6(b)(ii) Claim may be valid because 18.7 lies in CI
6(c) calculated mean and said no

7(a) Draw graph - DENSITY function, so have to differentiate
7(b) 61/6 but I got it wrong
3. Yeah man I think I got the exact same on both
4. (Original post by whysocereal)
What did you guys get for the last 3 marks on question 1? I got 0.622. For the last question I got 73/24 which is 3.042
i got the sameee
5. (Original post by Sam1231)
did anyone else get 73/24 for the very last question which is like 3.04167
Yea get in
6. for 1)e) i did (1-[P(X)=0])(1-[P(Y)=0])(1-[P(Z)=0]) where xyz are the different types
7. Any predictions for grade boundaries?
8. (Original post by lxsinglxbby)
i got the sameee
For the last part of q1 did you do (1-e^lambda{A})x(1-e^lambda{B})x(1-e^lambda{C})?
9. (Original post by whysocereal)
What did you guys get for the last 3 marks on question 1? I got 0.622. For the last question I got 73/24 which is 3.042
I got both of these answers.
10. (Original post by Salty carpet)
For the last part of q1 did you do (1-e^lambda{A})x(1-e^lambda{B})x(1-e^lambda{C})?
I did exactly that except (1-P(X<=0) and multipled all together and got 0.426 or something
11. (Original post by spmenz123)
I got both of these answers.
Same. Anyone remember their chi^2 value or how they found it? I merged the first two columns and then used Yate's correction... can't remember my value, although I did reject H1
12. What did you get for the interval question on island C? Now thinking i may have done island B by accident
13. (Original post by Salty carpet)
Same. Anyone remember their chi^2 value or how they found it? I merged the first two columns and then used Yate's correction... can't remember my value, although I did reject H1
I did that but accepted H0.

You can't accept or reject H1, only accept or reject H0.
14. (Original post by Jupers)
for 1)e) i did (1-[P(X)=0])(1-[P(Y)=0])(1-[P(Z)=0]) where xyz are the different types
Yes! I thought this was wrong - I got an answer of 0.462
15. (Original post by Salty carpet)
Same. Anyone remember their chi^2 value or how they found it? I merged the first two columns and then used Yate's correction... can't remember my value, although I did reject H1
Yeah I did both merging and Yate's, and also accepted H0, can't remember my value though.
16. (Original post by Suits101)
Yes! I thought this was wrong - I got an answer of 0.462
I got 0.622 :/
17. (Original post by spmenz123)
Yeah I did both merging and Yate's, and also accepted H0, can't remember my value though.
2.3386 look familiar?
18. How did everyone find the exam overall? Similar difficulty to last year?
19. (Original post by tanyapotter)
I got 0.622 :/
I got 0.622 as well
20. (Original post by Suits101)
2.3386 look familiar?
I think that is the value I got, although I rounded it to 2.34

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