Use the information to construct 90% and 99% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.
Researchers surveyed a random sample of 32 U.S. workers ages 16 years and over who did not work from home and asked how long (in minutes) it takes them to get from home to
work. The responses are listed
31 49 37 44 30 28 26 39 15 48
17 36 28 36 30 14
75 13 5 51 27 51 27 74 42 26 17 41 32 21 60 85
From past studies, the researchers assume that o is 18.7 minutes.
Construct the 90% and 99% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence intervals
The 90% confidence interval is (30.7 41.5). (Round to one decimal place as needed)
The 99% confidence interval is
(Round to one decimal place as needed.)