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Assume that a sample is used to estimate a population mean μ . Find the 95%...

Assume that a sample is used to estimate a population mean μ . Find the 95% confidence interval for a sample of size 64 with a mean of 66.3 and a population standard deviation of 11.1. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.

95% C.I. =

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