Anyone who plays or watches sports has heard of the "home field advantage." Teams tend to win more often when they play at home. Or do they? If there wes no home field advantage, the home teams would win about half of all games played. In the 2007 Major League Baseball season, there were2431 regular-sease games. It turns out that the home team won 1319 of the 2431 games, or 54.26% of the time. Could this deviation from 50% be explained just from natural sampling variability, or is it evidence to suggest that there really is a home field advantage, at least in professional baseball? Hypotheses: Model: Mechanics: Conclusion:

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