a. Construct a graphic representation of the Table 12.1 data using six sideby-

side dotplots.

b. Visually estimate the mean commute time for each city and locate it with an X.

c. Does it appear that the city has an effect on the average amount of time spent by workers who commute to work during the 8:00 AM rush hour? Explain.

d. Does it visually appear that the city has an effect on the variation in the amount of time spent by workers who commute to work during the 8:00 AM rush hour? Explain.