In a random sample of 25 people, the mean commute time to work was 32.6 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean . What is the margin of error of 7 Interpret the results. The confidence interval for the population mean u is (30.8, 34.4). (Round to one decimal place as needed.) The margin of error of u is (Round to one decimal place as needed.)