In a random sample of 21 people, the mean commute time to work was 31.3 minutes and the standard deviation was 7.2 minutes. Assume the population is normally distributed and use a t-distribution to construct a 98% confidence interval for the population mean mu. What is the margin of error of mu? Interpret the results. The confidence interval for the population mean mu is left parenthesis nothing comma nothing right parenthesis . (Round to one decimal place as needed.) The margin of error of mu is
margin of error is 3.972
margin of error is 4.0 approximately.
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