Question: couldnt find the expected value 2. (25 points) Let X, X,,..., X be a random sample from a normal distribution N(u,,0 ) and Y, Y,,..,

couldnt find the expected value

2. (25 points) Let X, X,,..., X be a random sample from a normal distribution N(u,,0 ) and Y, Y,,.., Y be another random sample (independent from the first sample) from N(u,,, o') . Define the sample variances for these random sample as m n-1 ( X, - X ) and Sm = m - 1 ( Y, - Ym)2 =1 where X. = X, and Ym = n I'M m Yi . 1= 1

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