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A study was conducted to estimate , the mean commute distance that all employed U.S. adults travel to work. Suppose a random sample of 49

A study was conducted to estimate , the mean commute distance that all employed U.S. adults travel to work. Suppose a random sample of 49 employed U.S. adults gives a mean commute distance of 22 miles and that from prior studies, the population standard deviation is assumed to be = 8.4 miles.

How large a sample of U.S. adults is needed in order to estimate with a 95% confidence interval oflength2.4 miles?

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