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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. 12 6 9 8 11 10 10 11 8 9 11 12 12 7 12 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 ( 8.5 , 11.3 ). (Round to one decimal place as needed.) The 99% confidence interval is ( 4.5 , 6.2 ). (Round to one decimal place as needed.) Which interval is wider? O The 90% confidence interval O The 99% confidence interval