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A sample of size n =94 is drawn from a normal population whose standard deviation is o = 7.2.. The sample mean is x =

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A sample of size n =94 is drawn from a normal population whose standard deviation is o = 7.2.. The sample mean is x = 45.71. Part 1 of 2 (a) Construct a 99.9% confidence interval for J. Round the answer to at least two decimal places. A 99.9% confidence interval for the mean is

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