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1. Let X1,X2, ....X, be a random sample of size n from a population of size N with mean u and variance o. Show that

1. Let X1,X2, ....X, be a random sample of size n from a population of size N with mean u and variance o. Show that X is an unbiased estimator of #. What about the estimator 82 = ![(x, - x) ? Justify. n 1=1

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