HYPOTHESIS TEST SUMMARY (SHOW ALL WORK) The z-Test According to a 2009 U.S. Census Bureau survey during, 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 commuter 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 .01 level of significance

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