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Suppose the number of minutes spent exercising each day for adults in the U.S.are normally distributed with an unknown population mean and standard deviation. If

Suppose the number of minutes spent exercising each day for adults in the U.S.are normally distributed with an unknown population mean and standard deviation. If a random sample of20

adultsis taken to estimate the mean length of daily exercise, use a calculator to find thet

-score that should be used to find a80%

confidence interval estimate for the population mean.

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