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

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Reply 80

RockyG

Original post by lol ok but

What values did people get for the chi squared? Did you reject or accept H0?

Reply 81

Suits101

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

(edited 7 years ago)

Reply 82

Salty carpet

Yeah man I think I got the exact same on both

Reply 83

lxsinglxbby

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

Reply 84

Salty carpet

Original post by Sam1231

did anyone else get 73/24 for the very last question which is like 3.04167

Yea get in :wink:

Reply 85

Jupers

for 1)e) i did (1-[P(X)])(1-[P(Y)])(1-[P(Z)]) where xyz are the different types

Reply 86

Krithika256

Any predictions for grade boundaries?

Reply 87

Salty carpet

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})?

Reply 88

spmenz123

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.

Reply 89

Suits101

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

Reply 90

Salty carpet

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

Reply 91

liamj1990

What did you get for the interval question on island C? Now thinking i may have done island B by accident

Reply 92

Suits101

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.

Reply 93

Suits101

Original post by Jupers

for 1)e) i did (1-[P(X)])(1-[P(Y)])(1-[P(Z)]) where xyz are the different types

Yes! I thought this was wrong - I got an answer of 0.462

Reply 94

spmenz123

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