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D Let X denote the sample average from a random sample with mean , Mariande ba Consider the estimator W for u, where: = n

D Let X denote the sample average from a random sample with mean , Mariande ba Consider the estimator W for u, where: = n - 1 (i) What is the bias, if any, of the estimator W/? [2 marks] (ii) What is the variance of the estimator W? [2 marks]

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