12.3

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This exercise gives you the chance to examine an age old social science dispute: whether hitting or pitching wins ball games.  Help shed light on this dispute by, again, turning to a recent  almanac, this time to collect winning percentages, team batting averages, and team earned-run averages for all the teams in either the American or the National League for one year.  Use data collection techniques similar to those you used for the last two exercises, this time collecting data on three variables, rather than two.  Moreover,you should use the data analysis technique so for   exercise, this time examining the relationship between winning percentage and team batting average, on the one hand, and winning percentage and team earned-run average, on the other.  Are both batting average and earned-run average associated with winning percentage? Which, would you say, is more strongly associated with it? Why? Write a brief essay in which you state how your analysis bears on this research question.

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