To compare commuting times in different locations, independent random samples were obtained from six cities presented in the "Longest Commute to Work" graphic on page 255 in your textbook. The samples were from workers who commute to work throughout the 8:00 a.m. rush hour. One-way Travel to Work in Minutes

Atlanta Boston Dallas Philadelphia Seattle St. Louis

29 18 42 29 30 15

21 37 25 20 23 24

20 27 26 33 31 42

15 25 32 37 39 23

37 32 20 42 14 33

26 34 26 18

48 35

a. Construct a graphic representation of the data using six sid-by-side dotplots.

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

c. Does it appear that different citites have different effects on the average amount of time spent by workers who commute to work during the 8:00 a.m. rush hour? Explain.

d. Does it visually appear that different cities have different effects on the variation in the amount of time spent by workers wo commute to work during the 8:00 a.m. rush hour? Explain.