Is it defense or offense that wins football games? Consider the following data, which include a teams

Is it defense or offense that wins football games? Consider the following data, which include a team’s winning record (Win), the average number of yards gained, and the average number of yards allowed during the 2009 NFL season. The complete data, labeled Football, can be found on the text website.

a. Compare two simple linear regression models, where Model 1 predicts winning percentage based on Yards Gained and Model 2 uses Yards Allowed.
b. Estimate a multiple linear regression model, Model 3, that applies both Yards Gained and Yards Allowed to forecast winning percentage. Is this model an improvement over the other two models?Explain.

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Team Arizona Cardinals 62.50 Atlanta Falcons 56.30 Win (%) Yards Gained Yards Allowed 346.40 348.90 344.40 340.40 25.00 312.50 Washington Redskins 319.70