In an application to estimate the mean number of miles that employees commute to work roundtrip each

In an application to estimate the mean number of miles that employees commute to work roundtrip each day, the following information is given: n = 20; sample mean = 4.33; sample standard deviation of s = 3.50 miles. Assuming the parent population is normal, what is the upper limit for a 95 percent confidence interval?

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