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A researcher wants to determine a 99 confidence interval

Question: A researcher wants to determine a 99% confidence interval for the mean number of hours that adults spend per week doing community service. How large a sample should the researcher select so that the estimate is within 1.2 hours of the population mean? Assume that the standard deviation for time spent per week doing community service by all adults is 3 hours.

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Basic Statistics: A researcher wants to determine a 99 confidence interval

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