Mathematics, 24.04.2020 20:30, speresenko

Let X1,X2X7 denote a random sample from a population having mean \mu and variance \sigma2.. Consider the following estimators of \mu:\theta1=X1+X2++X7 / 7\theta2= (2X1-X3+X5) / 2a. Is either estimator unbiased?b. Which estimator is best? In what sense is it best? Calculate the relative efficiency of the 2 estimtors.

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