Refer to the Baseball 2012 data, which report information on the 30 Major League Baseball teams for the 2012 season.

a. At the .10 significance level, is there a difference in the variation in team salary among the American and National League teams?

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 number of home runs hit per team? Use the .05 significance level.

d. Using the same attendance variable developed in part (b), is there a difference in the mean salary of the three groups? Use the .05 significance level.