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8.l5. If a random sample of size n is selected without replacement from the nite population that consists of the integers 1, 2,. . .

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8.l5. If a random sample of size n is selected without replacement from the nite population that consists of the integers 1, 2,. . . ,N, show that (a) the mean of? is N+1; (N+1)(Nn). (b) the variance of Y is , 12n (c) the mean and the variance of Y = n . X are n(N + 1) n(N + 1)(N -n) and var(Y) = 2 12

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