To investigate the youth use of the Internet, a sample of 8 adults was asked to report the number of hours they spent on the Internet during the last month. The results are listed below: 40, 52, 37, 60, 39, 42, 50, 30 a. Find the point estimator of the mean ( [J ) for the number of hours the adults spent on the Internet per month. b. Construct a 90% confidence interval for the population mean. Use 0L=0.1U