Refer to the Baseball 2018 data, which report information on the 30 Major League Baseball teams for the 2018 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.

Data From Baseball 2018:

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Year Average Salary Median Salary (SMillions) CPI 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 $2,555,416 2,486,609 2,632,655 2,699,292 2,820,000 3,150,000 3,240,206 3,297,828 1.055 218.060 1.100 3,305,393 3,440,000 224.939 1.020 229.594 3,386,212 1.750 232.957 3,820,000 1.643 236.736 1.925 4,250,000 4,400,000 237.017 1.475 240.007 4,470,000 1.600 245.120 4,520,000 1.750 251.107