Question: Let X1, . . . ,Xn be iid N(, ^2) -distributed with unknown and ^2. Find r15 such that (0, r15) is a 99%-confidence interval

Let X1, . . . ,Xn be iid N(, ^2) -distributed with unknown and ^2. Find r15 such that (0, r15) is a 99%-confidence interval for ^2 when the sample size is 15 and the sample variance is 20.

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