American League baseball teams play their games with the designated
American League baseball teams play their games with the designated hitter rule, meaning that pitchers do not bat. The league believes that replacing the pitcher, traditionally a weak hitter, with another player in the batting order produces more runs and generates more interest among fans. Below are the average numbers of runs scored per game by American League and National League teams for the 2012 season.
Use a Mann-Whitney method to test whether there is really a difference in number of runs scored.
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