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20. Let X1, .... X, ~ Ber(p). Show that the variance of X attains the Cramer-Rao lower bound, and hence X is the best unbiased

20. Let X1, .... X, ~ Ber(p). Show that the variance of X attains the Cramer-Rao lower bound, and hence X is the best unbiased estimator (MVUE) of p

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