In 2009, the New York Yankees won 103 baseball games during the regular season. The table on the next page lists the number of victories (W), the earnedrun average (ERA), and the batting average (AVG) of each team in the American League. The ERA is one measure of the effectiveness of the pitching staff, and a lower number is better. The batting average is one measure of effectiveness of the hitters, and a higher number is better.

(a) Develop a regression model that could be used to predict the number of victories based on the ERA.

(b) Develop a regression model that could be used to predict the number of victories based on the batting average.

(c) Which of the two models is better for predicting the number of victories?
(d) Develop a multiple regression model that includes both ERA and batting average. How does this compare to the previous models?

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