In a random sample of 25 people, the mean commute time to work was 33.4 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 99% confidence interval for the population mean p. What is the margin of error of u? Interpret the results. The confidence interval for the population mean u is ( 29.4 , 37.4 ) (Round to one decimal place as needed.) The margin of error of u is (Round to one decimal place as needed.)