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In a random sample of 21 ​people, the mean commute time to work was 31.3 minutes...

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

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margin of error is 3.972

margin of error is 4.0 approximately.

please like ??

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