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# Statistics S1B 17/05/2013 Thread Watch

1. (Original post by Pharaoh96)
Can anyone remember any of the answers that they got for the second part of the bowling probability question? I got 0.72, 0, 0.684, 0.00425. Are they right?
I definitely got the same as you for the last one but I can't remember anything else
2. (Original post by seajamiet)
My Confidence interval for Q6 was 19.7 lower and 20.1 upper
MY standard error for Q6 was 0.08 when it equals sigma/sqrootN (I remember doing sqroot10)
Q6Bi: I got 0.012
Q6BII I got 0.762

For The PMCC question about which has strongest correlation i said X with Y was the strongest correlation.
I got all that

x-y was the most strongest correlated

I think the r value came to 0.98 when you had to calculate it

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3. For the second part of probabilities i worked out percentages and got 89 and 84 percent i believe. On one of those probabilities i got 0
4. (Original post by hodge95)
Hi, please correct me if I'm wrong but I don't think you were meant to do it to the power of 10 as you were asked for 'each bag' and not '10 bags'??
I can't remember the question so someone else has to correct me on this

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5. Not sure if I did it right, but I did one tree diagram for Wednesday and one for Thursday, then found the probability that they both didn't bowl for wednesday and then prob that they both didn't bowl on thursday and X them together. Final answer was 0.0425???
6. (Original post by Pharaoh96)
Not sure if I did it right, but I did one tree diagram for Wednesday and one for Thursday, then found the probability that they both didn't bowl for wednesday and then prob that they both didn't bowl on thursday and X them together. Final answer was 0.0425???
It was 0.00425
7. (Original post by seajamiet)
For the second part of probabilities i worked out percentages and got 89 and 84 percent i believe. On one of those probabilities i got 0
Yeah The one marker probability question

P ( the girl bowls and Dave doesn't bowl) or something = 0

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8. (Original post by Son234)
I got all that

x-y was the most strongest correlated

I think the r value came to 0.98 when you had to calculate it

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Correlations were 0.6, 0.91 and 0.98 to as many sig figs i can remember from the test
9. For the last part of the auction house question, did people get the answer as 27 (out of 40)?
I literally had no idea what I was doing
10. (Original post by RoseBrilliante)
For the last part of the auction house question, did people get the answer as 27 (out of 40)?
I literally had no idea what I was doing
40x0.85 = p(met reserve price)

34x0.5= p(met lowest estimate price)

17x(1-0.175)= p(did not meet the highest estimate price)

So it was 14 that's my logic

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11. (Original post by maggiehodgson)
Did you do two probability trees (Wed & Thurs) and then a combination tree? That's what I did but it was only a guess.
Yeah but no combination tree, I was going to add the probabilities off the two tables but it would get more than 1, so I divided it by 2 as there was 2 days, I know it's wrong, but...
12. (Original post by seajamiet)
Correlations were 0.6, 0.91 and 0.98 to as many sig figs i can remember from the test
Yep

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13. (Original post by Son234)
Uh huh you know what It is those are what I got

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I got those too
14. (Original post by Son234)
40x0.85 = p(met reserve price)

34x0.5= p(met lowest estimate price)

17x(1-0.175)= p(did not meet the highest estimate price)

So it was 14 that's my logic

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Yeah, I probably got it wrong then :/
15. Did everyone find that it was different to the past paper questions by far and they expected you do a lot more!
16. (Original post by RoseBrilliante)
Yeah, I probably got it wrong then :/
I put 27 too
17. (Original post by Welbeck)
Did everyone find that it was different to the past paper questions by far and they expected you do a lot more!
Yeaah it was different, like the line of regression I don't think I got that one quite right.
18. (Original post by Ingamo)
I put 27 too
Everyone I know put 27
19. (Original post by Welbeck)
Did everyone find that it was different to the past paper questions by far and they expected you do a lot more!
Definitely: past papers are a lot easier... I don't think I've ever had to calculate the product correlation coefficient manually before (but then again, I've not done all of the past papers). And where were the scatter graphs?? I was looking forward to seeing those in the paper as well!
20. Yes, for me.

So different. So time consuming. However, someone on this thread says they had 30mins to spare!!!! So.......

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