Math 221-In A Random Sample Of 28People, The Mean

In a random sample of 28people, the mean commute time to work was 34. 6minutes and the standard deviation was 7. 2minutes. Assume the population is normally distributed and use a t-distribution to construct a 99% 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 ? is