Use the given confidence interval to find the margin of error and the sample mean. (73.0,86.8) ..... The sample mean is.(Type an integer or a decimal.) In a random sample of 18 people, the mean...

Extracted text: Use the given confidence interval to find the margin of error and the sample mean. (73.0,86.8) ..... The sample mean is.(Type an integer or a decimal.) In a random sample of 18 people, the mean commute time to work was 31.5 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 u. What is the margin of error of µ? Interpret the results. The confidence interval for the population mean u is ( D- (Round to one decimal place as needed.)