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A sample of size n = 90 is drawn from a normal population whose standard deviation is o =6.4. The sample mean is x =

A sample of size n = 90 is drawn from a normal population whose standard deviation is o =6.4. The sample mean is x = 49.86. Part 1 of 2 (a) Construct a 99.8% confidence interval for u. Round the answer to at least two decimal places. A 99.8% confidence interval for the mean is 47.78

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