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A random sample of 9 is selected from a normally distributed population and provides a sample mean of 239.2 with a standard deviation of 64.4.

A random sample of 9 is selected from a normally distributed population and provides a sample mean of 239.2 with a standard deviation of 64.4. A 99% confidence interval estimate of the population mean is 239.2 Answer (please provide a positive number to 2 decimal places).

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