OCR (not MEI) S3 6 June Discussion

I haven't seen a thread on this so I thought I might start a new one. How did everyone find it? I think I definitely dropped a lot of marks :mad:

:mad:

Did anyone get 4 as the value of c? :smile:

:smile:

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Nah i got like 0.8 something. Pretty sure I'm wrong :/ was a weird paper

OP

Original post by Ilikefood

Nah i got like 0.8 something. Pretty sure I'm wrong :/ was a weird paper

Everyone I know got 0.8something so you're probably right haha. Yh it was dodgy I hope grade boundaries are lowish compared to usual S3 boundaries

what is the variance for Q1?
time 38 square or 38?
any idea?

OP

Original post by 619809

what is the variance for Q1?
time 38 square or 38?
any idea?

I got whatever 0.9^2 * 38 is for the variance in q1 and I think my final answer was 0.8771..?

Original post by hornet_56

I got whatever 0.9^2 * 38 is for the variance in q1 and I think my final answer was 0.8771..?

I got mean=133 and variance =30.78
Probability between 120 and 140 is something like 0.8869=0.887

It was just the variance times by 38 right? and the population estimate was something around 5000?

What did people get for the constants 'a' and 'b'

Original post by Ilikefood

It was just the variance times by 38 right? and the population estimate was something around 5000?

just time 38 for vanriance
Q2 population is (250*500)/24=5208
that was what i did

OllieAshworth13

'a' and 'b' were 6/5 i think

i.e 1.2

do we need to use yate correction for the chi square?

OP

Yeah I used Yates' correction for chi squared
What was the confidence interval for total number of rabbits? I put roughly 3000 and 8000

Original post by hornet_56

Yeah I used Yates' correction for chi squared
What was the confidence interval for total number of rabbits? I put roughly 3000 and 8000

i thought it was number of marked rabbit.....did i misread it...

Yeh I put vaguely 3000 and 8000. the lower CI from the previous part gave the 8000 and the higher CI gave the 3000 i think?

hmm I got 1/5 for b and something like 14/15 for a but i think i got a wrong

Original post by Ilikefood

hmm I got 1/5 for b and something like 14/15 for a but i think i got a wrong

i got both a & b =1.2

OllieAshworth13

I reckon high grade boundaries, perhaps 63 for an A

I couldn't remember who to integrate lny :frown:

:frown:

OllieAshworth13

Original post by Ilikefood

I couldn't remember who to integrate lny :frown:

:frown:

that was quite cheeky of them, but there was hint in the form that we had to show what F(x) was given the final answer

What did everyone get for the q where you are asked to estimate the sample size for which the sample mean differs from mew by less than 0.05 with probability 0.95 i got 3840 or something, but some people got 2700 or something not sure.

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