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Problem 5: (10 pts) Student t distribution with d degrees of freedom is symmetric (so its population mean is zero) and has a population variance

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Problem 5: (10 pts) Student t distribution with d degrees of freedom is symmetric (so its population mean is zero) and has a population variance -_, for all d > 2. If Xgo is the Sample Mean of a sample X1, X2. .... X90 from (4), what is its expected value and variance

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