[EX12-01] Let x one-way travel to work in minutes. Independent and random samples were obtained in each of the six different U.S.

cities from workers who commute to work during the 8:00 AM rush hour.

a. Construct a side-by-side boxplot showing the six cities.

b. Does your graph show visual evidence suggesting that the city has an effect on the average morning commute time? Justify your answer.

c. Using the ANOVA technique learned in this chapter, do these data show sufficient evidence to claim that the city has an effect on the average morning commute time? Use 0.05.

d. Does the statistical answer found in part c agree with your graphical display in part a and your response in part b? Explain why your answers agree or disagree, citing statistical information learned in this chapter.

e. “Does the sample show that the city has an effect on the amount of time spent commuting to work?” “Does the sample show that the city has an effect on the average amount of time spent commuting to work?” Are these different questions? Explain.
Your Study

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