The following table gives a football teams season-tickets sales, percentage of games won, and number of active alumni for the years from 1998 to 2011.

Year	Season-Ticket Sales	Percentage of Games Won	Number of Active Alumni
1998	4,995	40	NA
1999	8,599	54	3,450
2000	8,479	55	3,801
2001	8,419	58	4,000
2002	10,253	63	1,098
2003	12,457	75	6,315
2004	13,285	36	6,860
2005	14,177	27	8,423
2006	15,730	63	9,000
2007	15,805	70	9,500
2008	15,575	72	9,530
2009	15,900	75	9,550
2010	14,010	80	9,560
2011	12,500	82	9,575

1. Estimate a regression model for sales = Percentage of games won.
2. Estimate a regression model for sales = Number of active alumni.
3. If sales is the dependent variable, which of the two independent variables do you th8ink explains sales better? Explain.