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42. Refer to the Baseball 2000 data in Appendix D, which reports information on the 30 Major League Baseball teams for the 2000 season.

a. At the .10 significance level, is there a difference in the variation of the number of stolen bases among the teams that play their home games on natural grass versus on artificial turf?

b. Create a variable that classifies a team's total attendance into three groups: less than 2.0 (million), 2.0 up to 3.0, and 3.0 or more. At the .05 significance level, is there a difference in the mean number of games won among the three groups?

c. Using the same attendance variable developed in part (b), is there a difference in the mean team batting average?

d. Using the same attendance variable developed in part (b), is there a difference in the mean salary of the three groups?