A random sample of size 10 is selected from the n 20 5, Ask an Expert

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Which is the mgf of the chi-square distribution with n - 1 df. (This is a partial proof because we have not proven the independence of U and V .) A random sample of size 10 is selected from the N (20, 5) distribution. What is the probability that the variance of this sample exceeds 10?

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