random sample of 8 ​people, the mean commute time to work was 34.5 minutes and the standard deviation was 7.2 minutes. A 98​% confidence interval using the​t-distribution was calculated to be...

random sample of

​people, the mean commute time to work was

minutes and the standard deviation was

minutes. A

confidence interval using the​t-distribution was calculated to be

After researching commute times to​ work, it was found that the population standard deviation is

minutes. Find the margin of error and construct a

confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.