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# Wjec S2 2016

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1. Seemed fine, how'd everybody find it?

Inb4 "On the table hurhurhurhurhur!"
2. I loved that paper, apart from question 4? Was a bit different but I think I did the right thing!
3. (Original post by ahannah)
I loved that paper, apart from question 4? Was a bit different but I think I did the right thing!
That the one with the dogs? How'd you deal with that?
Yeah, it was a tad odd.
4. (Original post by WhisperingTide)
That the one with the dogs? How'd you deal with that?
Yeah, it was a tad odd.
no the difference between two sample means?
5. (Original post by ahannah)
no the difference between two sample means?
Oh? I found that to be fairly fine, just took a bit of work, I think it was actually the second part of the first question that threw me; took me a while to work out how to do it. :P
6. (Original post by WhisperingTide)
Oh? I found that to be fairly fine, just took a bit of work, I think it was actually the second part of the first question that threw me; took me a while to work out how to do it. :P
what did you do for it? Haha I'm not sure if I did that right... i worked out P(X=4) and P(Y=4) using the formula for poisson distribution and multiplied them...
7. (Original post by ahannah)
what did you do for it? Haha I'm not sure if I did that right... i worked out P(X=4) and P(Y=4) using the formula for poisson distribution and multiplied them...
Well, I got E(W) = 6 and Var(W) = 36
Made that into a Normal: N~( 6 , 36 )
And continuity corrected either side, giving: P(3.5 < 4 < 4.5)
Not sure if that's right, though. >.> What did you get as an answer?
8. (Original post by WhisperingTide)
Well, I got E(W) = 6 and Var(W) = 36
Made that into a Normal: N~( 6 , 36 )
And continuity corrected either side, giving: P(3.5 < 4 < 4.5)
Not sure if that's right, though. >.> What did you get as an answer?
hmm why would you make a normal approximation? It wasn't a large enough mean value surely? I can't remember, I think it was around 0.015?
9. (Original post by ahannah)
hmm why would you make a normal approximation? It wasn't a large enough mean value surely? I can't remember, I think it was around 0.015?
I seem to recall combinations of observations of random variables are normally distributed by default, or something like that. Actually, I think I got around that anyway, so that's awesome!
10. (Original post by WhisperingTide)
Well, I got E(W) = 6 and Var(W) = 36
Made that into a Normal: N~( 6 , 36 )
And continuity corrected either side, giving: P(3.5 < 4 < 4.5)
Not sure if that's right, though. >.> What did you get as an answer?
I got the same values for E(W) and Var(W), but for the second part I multiplied the two poisson values to get Po~(6), and then did P(W≥4) - P(W≥5), but that was just a blind shot in the dark! Hopefully someone will be able to upload the paper on here.
11. What do people reckon the grade boundaries will be? Can S2 count towards an A* in further maths?
12. (Original post by roganjosh4444)
What do people reckon the grade boundaries will be? Can S2 count towards an A* in further maths?
Average and yes.

You need at least 90 UMS in the best 3 of: S2, S3, FP2, FP3, M2, M3.

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