For its "Teenage Life Online" report, representatives of the Pew Internet and American Life Project conducted phone interviews with 754 randomly selected young people between the ages of 12 and 17 to learn about the Internet habits of US teenagers.If the survey reports that the average time spent online was 8.8 hours per week for the 342 participants in the sample, build a 90% confidence interval estimate of the average time spent online per week by the population of US teenagers repre- sented here. (Assume the standard deviation for the population of online times is known to be 5.6 hours.)