In a random sample of 20 people, the mean commute time to work was 33.5 minutes and the standard deviation was

7.2 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean

Construct the confidence interval for the population mean it using a t-distribution ... In a random sample of eight people, the mean commute time to work was 35.5 minutes and the sample standard deviation was. 7.2 minutes ... Use a t-distribution to find the margin of error and construct a 95% ... Assume normal distribution.