According to a 2009 survey based on the United States census (http://www.census.gov/prod/2011pubs/acs-15.pdf), the daily one-way commute time of U.S. workersaverages 25 minutes with, we'll assume, a standard deviation of 13 minutes. Aninvestigator wishes to determine whether the national average describes the meancommute time for all workers in the Chicago area. Commute times are obtained fora random sample of 169 workers from this area, and the mean time is found to be22.5 minutes. Test the null hypothesis at the .05 level of significance.