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# Statistics S1B 17/05/2013 Thread watch

1. (Original post by Ingamo)
I put 27 too
Yeah, you just worked out the probability, and then the mean, which would be the expected result (27)
2. (Original post by Ingamo)
I put 27 too
Wow. I might have got a probability question right for once O_O
3. (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
I got that
4. 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 :/
5. Unofficial Mark Scheme anyone?
6. So the exam wasn't too bad eh.

(Original post by RoseBrilliante)
I definitely got the same as you for the last one but I can't remember anything else
I'm one of those people who delete everything (involuntarily) on the ol' noggin after the exam's over, but that answer seems familiar to me too.

I think it was the 'b' part of the prob question.
7. (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 :/
that is exactly what I got.

what did you get for the very last part of question 6?

(and sorry for the double post...if that matters here)
8. (Original post by MrJiggly)
that is exactly what I got.

what did you get for the very last part of question 6?

(and sorry for the double post...if that matters here)
Im not sure on the exact value but for the second to last i used variance/n

and for the last i only did it normally so like P(X>25) for variance.

I have no idea if that makes sense or not but it might be wrong because people are talking about ^10 :L I cant really remember the question properly either :/ sorry!
9. (Original post by RoseBrilliante)
Wow. I might have got a probability question right for once O_O
Uhhh... i put 28? Anyone else get this cuz im obviously wrong.

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10. (Original post by M^2012)
Yeah, you just worked out the probability, and then the mean, which would be the expected result (27)
Fair to say i think I over thought mine lol

But that still doesn't make sense to me

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11. (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 :/
I got that but I just put +1.00x don't know why habit :L

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12. (Original post by Son234)
Fair to say i think I over thought mine lol

But that still doesn't make sense to me

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The probability was 0.85-0.175 i think
and then you times that number by 40 and you get 27 i think
13. (Original post by EmilyC96)
Im not sure on the exact value but for the second to last i used variance/n

and for the last i only did it normally so like P(X>25) for variance.

I have no idea if that makes sense or not but it might be wrong because people are talking about ^10 :L I cant really remember the question properly either :/ sorry!
yea I used (σ/√n) - same thing

for the last one I divided the answer on my calc by 10 for some weird reason.
14. (Original post by Ingamo)
The probability was 0.85-0.175 i think
and then you times that number by 40 and you get 27 i think
Yep that makes sense! 73/75

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15. (Original post by Son234)
Yep that makes sense! 73/75

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If you're confident you got full marks on everything else then that's still effing amazing! I'd be lucky if I got a B
16. Terrible paper. Hope grade boundaries drop to 57 like some previous years.
17. (Original post by RoseBrilliante)
If you're confident you got full marks on everything else then that's still effing amazing! I'd be lucky if I got a B
It just means i know i have lost 2marks so I have 73 marks to play for lol

Atm which I'm sure will decrease by this evening

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18. (Original post by Son234)
It just means i know i have lost 2marks so I have 73 marks to play for lol

Atm which I'm sure will decrease by this evening

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Oh hahah But still, you seemed quite confident anyway. I bet you would've done well
19. (Original post by RoseBrilliante)
Oh hahah But still, you seemed quite confident anyway. I bet you would've done well
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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20. (Original post by Son234)
Yep that makes sense! 73/75

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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

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