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 o is 2.1 minutes and that the population of times is normally distributed. 7 12 7 7 6 11 7 6 6 6 10 6 9 11 10 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 ( 8.95 , 10.65 ). (Round to one decimal place as needed.)