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2. (Confidence interval for with unknown 2) Six independent measurements are taken from a normal population. The sample has values x1 = 21, x2 =

2. (Confidence interval for with unknown 2) Six independent measurements are taken from a normal population. The sample has values x1 = 21, x2 = 19, x3 = 22, x4 = 20, x5 = 18, and x6 = 24. Find a 99% confidence interval for the mean.

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