Question

Assume that a sample is used to estimate a population mean μμ. Find the 90% confidence interval for a sample of size 53 with a mean of 56.8 and a standard deviation of 10.5. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.

90% C.I. =

The answer should be obtained without any preliminary rounding.

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