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# Statistics S1B 17/05/2013 Thread watch

1. (Original post by Ingamo)
Haha yeahh same, I did the write method but got the wrong number -_-
You can usually drop 15-20 marks and still get an A though
A*?

..... just kidding I will very happy if I manage to get a B how about you?

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2. (Original post by EmilyC96)
What did people put for the last couple of questions for 4. Like calculate the least squares regression line ?
I got y = 0.6 + x
But I'm not sure I'm right because I just used a random formula from the booklet because I haven't come across anything like it before :/
YES! I got that too.
3. (Original post by Son234)
I wish you didn't say that

Really cheers me down lol

And hopefully grade boundaries will be low so everyone is happy

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Everyone does better than they think Except for me... in January... ok, I'll shut up now. And yeah, hopefully I'm just hoping that the C2 grade boundaries are low (but is unlikely).
4. (Original post by seajamiet)
I got a - number so i know im wrong and thinking of it i believe it doesnt change as well.
I got 16.8F for the standard deviation, for the next question, I've multiplied it by (5/9).
5. (Original post by RoseBrilliante)
Everyone does better than they think Except for me... in January... ok, I'll shut up now. And yeah, hopefully I'm just hoping that the C2 grade boundaries are low (but is unlikely).

how did you do in C1 if you don't mind me asking?

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6. does anyone know what the grade boundaries will be like?
7. (Original post by Son234)

how did you do in C1 if you don't mind me asking?

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C1 in January? 3 UMS off a B. I knew I could do so much better so I resat C1 on Monday (did it before C2 on the same day) but found this resit much harder. So, could've done better, could've done worse but we'll just have to see in August
8. (Original post by Son234)
A*?

..... just kidding I will very happy if I manage to get a B how about you?

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Haha! :P
Yeah same, a B would be great!
9. How did you do the probability question with the diagram?
I couldnt do it
10. How did you get the last one to be that?
How did you do the probability question with the diagram?
I couldnt do it
Can someone tell me how many marks was for the diagram as I didn't read t and missed it obviously
12. (Original post by AMELIA-x)
Can someone tell me how many marks was for the diagram as I didn't read t and missed it obviously
Oh no, what diagram!?

You mean the question about reserve prices? I liked that question.
13. (Original post by AlanDu)
Oh no, what diagram!?

You mean the question about reserve prices? I liked that question.
Swear someone said something about a Venn diagram!
I didn't think the paper was any harder than the past papers!
How did you do the probability question with the diagram?
I couldnt do it
There was a diagram?
15. More like a table, it went
Reserve Price successful - 0.85
Reserve Price unsuccessful - ?
Lower Price successful - 0.5
Upper Price successful - 0.175

and it gave an example that if an object was sold at lower price but not upper price it was 0.325. Spent about 20 minutes rattling my brain trying to see how you get that answer, then realised you had to do 0.5 - 0.175?
16. (Original post by tetra-s)
More like a table, it went
Reserve Price successful - 0.85
Reserve Price unsuccessful - ?
Lower Price successful - 0.5
Upper Price successful - 0.175

and it gave an example that if an object was sold at lower price but not upper price it was 0.325. Spent about 20 minutes rattling my brain trying to see how you get that answer, then realised you had to do 0.5 - 0.175?
Haha I did exactly the same.. I was so confused as to where they got the number from. I have never had to take away probabilities before! :P
17. (Original post by tetra-s)
More like a table, it went
Reserve Price successful - 0.85
Reserve Price unsuccessful - ?
Lower Price successful - 0.5
Upper Price successful - 0.175

and it gave an example that if an object was sold at lower price but not upper price it was 0.325. Spent about 20 minutes rattling my brain trying to see how you get that answer, then realised you had to do 0.5 - 0.175?
i did 0.85 - 0.5 = 0.35. Your values are a bit mixed up in the table, maybe you did something different

i looked at it for ages and saw that they simply took away in their example
18. (Original post by tetra-s)
More like a table, it went
Reserve Price successful - 0.85
Reserve Price unsuccessful - ?
Lower Price successful - 0.5
Upper Price successful - 0.175

and it gave an example that if an object was sold at lower price but not upper price it was 0.325. Spent about 20 minutes rattling my brain trying to see how you get that answer, then realised you had to do 0.5 - 0.175?
I think the missing valu was 0.15
19. (Original post by Ingamo)
Haha I did exactly the same.. I was so confused as to where they got the number from. I have never had to take away probabilities before! :P
Glad to know I'm not alone haha! I was dead confused aswell but when I read the preamble at the top it kinda makes sense (like the upper price prob is included within the lower price prob )

And I also couldnt find out the third PMCC! it gave you sxy and sxx, but i couldnt find syy anywhere!
20. (Original post by tetra-s)
Glad to know I'm not alone haha! I was dead confused aswell but when I read the preamble at the top it kinda makes sense (like the upper price prob is included within the lower price prob )

And I also couldnt find out the third PMCC! it gave you sxy and sxx, but i couldnt find syy anywhere!
Unlucky, syy was at the top of the question, syy = 5880. I know how you feel about that mistake, I have made silly mistakes on the FP1 paper I did today.

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