According to a recent government population survey, the daily one-way commuting distance of U.S. workers averages 13 miles with a standard deviation of 13 miles. An investigator wishes to determine whether the national average describes the mean commuting distance for all workers in the Chicago area. Commuting distances are obtained for a random sample of 169 workers from this area, and the mean distance is found to 15.5 miles. Conduct the proper test to determine if the sample from Chicago differs from the population in terms of the average one-way commuting distance (a = .05). Make sure you state both hypotheses and summarize your results using the "Method of Presentation" format presented in your textbook. Be sure to include both the calculated and critical values for your test. Also, be sure to construct the non-directional 95% confidence interval as part of your summary.