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# AQA- Maths statistics 1b

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1. agreed c2 was a killer but everyone seams to be saying the same, so fingers crossed boundaries will be lowered
2. I found S1 actually quite easy compared to any of the past papers, did anyone feel the same?
3. (Original post by Mike1)
I found S1 actually quite easy compared to any of the past papers, did anyone feel the same?
Yeah to be honest, I thought it would be much harder than what it was. So glad the probability was already in a table...phew!!!
4. easier than C2 by a mile. some weirdly worded questions though, and SO many stupid mistakes. Just hoping it drags up the horrendous C2. Who knows..
5. Yeah the questions were worded kind of strangely. What did people put for the question where it asked if you used the central limit theorem?
6. I put no, HA.
But after having spoken to all my friends, its most likely wrong. I just blubbered for a bit and wrote anything (long exam, bore)
7. I put yes, as surely you had to use it, as in the qustion it did not state that the sample was assumed to be normally distributed, and in order to calculate a confidence intervals the sample means must be assumed to be normally distributed, and the only way you could tell this was by the Cental Limit Theorem as n>30
8. Yeah I've no idea. I just assumed it was normally distributed because it said something about a random variable. Not been taught anything about that the 'wordy' questions are always a pain.
9. I'm not sure though :/ But beacause its a random variable does that mean its normally distributed?
10. it would have stated it to be normally distributed in the question and i don't think it said it was. so i put " n > 30, yes " not sure if it's right though, just my guess.
11. does anyone remember what two values they got for their confidence intervals ?
12. I think I got one negative value???
13. I think i got something like 5.02 and 5.06. I don't know if thats right
14. i got a negative answer for 1 value and i tried a range of ways of doing it and each time one was negative so i stuck with it, it was -24. something and the other value i can't remember
15. (Original post by jckk)
i got a negative answer for 1 value and i tried a range of ways of doing it and each time one was negative so i stuck with it, it was -24. something and the other value i can't remember
I got that too, not sure if its right though :/
16. 5.02 and 5.08 ! :-)
17. Ooh btw, what did yous get for, I think it was a binomial one, something about the probability that all 6 do not contain whatever weight. I got something stupid like 8.64x10-4, but I literally went brain dead so I had to leave it..
18. (Original post by jckk)
does anyone remember what two values they got for their confidence intervals ?
4.98-5.12 (with 5.05 as the mean)
19. (Original post by jckk)
i got a negative answer for 1 value and i tried a range of ways of doing it and each time one was negative so i stuck with it, it was -24. something and the other value i can't remember

You cant have negative litres...
I think the answer was [5.02,5.08]
20. I really didn't get that one. I did (1-previous answer)^6 as a guess.

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