Professional athletes salaries are often criticized for being over the top. Many also earn even more money

Professional athletes€™ salaries are often criticized for being €œover the top.€ Many also earn even more money through endorsements. Various NBA (National Basketball Association) and MLB (Major League Baseball) players can be seen in many high-profile endorsements. Two random samples from each sport€™s player endorsements were selected and yielded the following amounts in millions of dollars.

a. At the 0.05 level of significance, is there a difference in the variability of endorsement amounts between NBA and MLB players? Assume normality of endorsement amounts.
b. At the 0.05 level of significance, is the mean endorsement amount for NBA players significantly higher than the mean endorsement amount for MLB players?

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NBA 16.0 15.0 21.7 12.0 9.5 0.5 15.5 0.8 2.5 5.0 16.0 15.5 MLB 6.0 8.0 2.5 0.3 3.5 0.5 0.5 0.3