that the average commuting time for citizens of both Baltimore, Maryland, and Miami, Florida, is approxi- mately 29 minutes. To see if their commuting times appear to be any different in the winter, random sam- ples of 40 drivers were surveyed in each city and the average commuting time for the month of January was calculated for both cities. The results are provided below. At the 0.05 level of significance, can it be concluded that the commuting times are different in the winter? Miami Baltimore Sample size Sample mean Population standard deviation 40 40 28.5 min 35.2 min 7.2 min 9.1 min Source: www.census.gov

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