The following table gives a football team€™s season-ticket sales, percentage of games won, and number of active alumni for the years 1996€“2005.

a. Compute a correlation matrix for the variables. A software statistical package is recommended. Interpret the correlation between each pair of variables.
b. Estimate a regression model for sales = Percentage of games won.
c. Estimate a regression model for sales = Number of active alumni.
d. If sales are the dependent variable, which of the two independent variables do you think explains sales better? Explain.

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Season-Ticket Percentage of Number of Active Alumni Year Sales Games Won 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 4,995 8,599 8,479 8,419 10,253 12,457 13,285 14,177 15,730 15,805 NA 3,450 3,801 4,000 4,098 6,315 6,860 8,423 9,000 9,500 40 54 58 63 75 36 63 70