# Edexcel S2

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#1
http://www.examsolutions.net/a-level...June/paper.php

See q3c. Why ii only? Why not i as well? i involves the unknown parameter the mean.

See q5b. For the first M1 mark do you have to say "Normal approximation"? What if you just say what's needed for the A1 mark Y~≈N(24,(√24)^2)? Does that give you the M1 mark?

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5 years ago
#2
For Q3 b), i IS a statistic. X(dash) is the sample mean, not a population parameter. ii contains the population mean, and because of this, is not a statistic.

For Q5, yes, you should state that you are going to use a Normal approximation of the Poisson distribution before you use it if you want to get full marks.
2
#3
(Original post by VannR)
For Q3 b), i IS a statistic. X(dash) is the sample mean, not a population parameter. ii contains the population mean, and because of this, is not a statistic.

For Q5, yes, you should state that you are going to use a Normal approximation of the Poisson distribution before you use it if you want to get full marks.
I get it now after looking at your post and reading a s2 book.

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