Answer Happy

p A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher assumes a is 1.9 minutes and that the population of times is normally distributed. 9 10 8 12 8 6 10 9 12 12 7 7 9 7 8 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 ( (Round to one decimal place as needed.)