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Question: sample variance varx ex2 21 n 2show the last line...

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Sample variance var(X) EX-2 21 n

·2·Show the last line in the expectation of the variance statement on sliden8is true using the definition of the variance, and the linearity of the expectation (hints: inside the square, split the terms into those involving x, and those involving X, j not equal to i, then subtract the mean from 1 term and add the mean to the other term)

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