# Question

According to a 2009 survey based on the United States Census (http://www.census.gov/prod/(http://www.census.gov/prod/2011pubs/acs-15.pdf), (http://www.census.gov/prod/2011pubs/acs-15.pdf), the daily one- way commute time of U. S. workers averages 25 minutes with ( we’ll assume) a standard deviation of 13 minutes. An investigator wishes to determine whether the national average describes the mean commute time for all workers in the Chicago area. Commute times are obtained for a random sample of 169 workers from this area, and the mean time is found to be 22.5 minutes. Test the null hypothesis at the .05 level of significance.

## Answer to relevant Questions

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