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

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1. (Original post by Renewhj)
Any workings for the last question? Realized I had the wrong mean value right after the exam. After all those nasty questions, am I gonna lose tons of marks on this one?😭😭😭

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I had to rush it so may have got it wrong, but you do the integral of x[f(x)] for each part of the graph, Using the limits given for each part. You then add them together. At least that's what I did. My answer was 3 point something

What were the answers for the four market where they gave you a CI and you had to find Sd and the mean? I got the sd, was the mean the same as x bar?
2. (Original post by irMike)
I had to rush it so may have got it wrong, but you do the integral of x[f(x)] for each part of the graph, Using the limits given for each part. You then add them together. At least that's what I did. My answer was 3 point something

What were the answers for the four market where they gave you a CI and you had to find Sd and the mean? I got the sd, was the mean the same as x bar?
I did the mean as the midpoint of the interval

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3. (Original post by irMike)
I had to rush it so may have got it wrong, but you do the integral of x[f(x)] for each part of the graph, Using the limits given for each part. You then add them together. At least that's what I did. My answer was 3 point something

What were the answers for the four market where they gave you a CI and you had to find Sd and the mean? I got the sd, was the mean the same as x bar?
I did exactly the same but😭 Can you describe the pdf graph you got? Might be this part that I got wrong. Yeah I put x bar for mean. Can't remember the answers sorry😦

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4. (Original post by irMike)
I had to rush it so may have got it wrong, but you do the integral of x[f(x)] for each part of the graph, Using the limits given for each part. You then add them together. At least that's what I did. My answer was 3 point something

What were the answers for the four market where they gave you a CI and you had to find Sd and the mean? I got the sd, was the mean the same as x bar?
31.7 for the mean and 2.96 for the variance ( it asked for variance not sd by the way )
5. Anyone got any idea for distribution of marks for the last question? I'm literally freaking out

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6. The pdf graph I got was a straight line of y=0.25 from 1 to 4 and then a straight diagonal line between 4 and 6 to 0.

I completely messed it up originally as I thought it wanted F(x) and not f(x)
7. 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
8. (Original post by Renewhj)
Anyone got any idea for distribution of marks for the last question? I'm literally freaking out

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5 for the graph and then another 4 or 5 for the next bit
9. did anyone else get 73/24 for the very last question which is like 3.04167
10. (Original post by lollypandahype)
5 for the graph and then another 5 for the rest of it I think, but I might be wrong
5 for the graph and 4 for the second bit it was
11. (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 recognise 3.042 and my friends said they got 0.6 something for final Q1
12. (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
Yeh i got both of these !!
13. (Original post by lollypandahype)
The pdf graph I got was a straight line of x=0.25 from 1 to 4 and then a straight diagonal line between 4 and 6 to 0.

I completely messed it up originally as I thought it wanted F(x) and not f(x)
I must have got the graph wrong cuz my graph was two broken lines. I just missed my a* in S2 I think. God I'm so desperate. But I did difeferentiation in (I) and did integration xf(x) in (ii), will I get at least 5 marks out of 10?

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14. (Original post by Sam1231)
did anyone else get 73/24 for the very last question which is like 3.04167
Yep yep
15. What do people think 70/75 will be?
16. For the contingency tables do you use yates's and V=1?
17. (Original post by Sam1231)
What do people think 70/75 will be?
At least an a*

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18. (Original post by Jupers)
For the contingency tables do you use yates's and V=1?
Yeah

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19. (Original post by Renewhj)
I must have got the graph wrong cuz my graph was two broken lines. I just missed my a* in S2 I think. God I'm so desperate. But I did difeferentiation in (I) and did integration xf(x) in (ii), will I get at least 5 marks out of 10?

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Definitely will get at least 5 marks, probably more. Because the first part required integration so you will get probably 3 marks if your f(x) was correct, but you just didn't draw it correctly. And then the second part did require integrating xf(x) so that's maybe 3 marks there.
20. What values did people get for the chi squared? Did you reject or accept H0?

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