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19. Suppose that X1, X2, .... X, are i.id. N(u, o' ). a. If u is known, what is the mle of o? b. If

19. Suppose that X1, X2, .... X, are i.id. N(u, o' ). a. If u is known, what is the mle of o? b. If o is known, what is the mle of y? c. In the case above (o known), does any other unbiased estimate of u have smaller variance

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