The manager of a major league baseball team is interested in predicting the number of games the team will win in the upcoming season. To do this, the manager collects data on the team's payroll and various statistics for each player. The manager believes that the team's past wins may also influence how many games the team will win this year. How might the manager incorporate this effect into the model? By increasing the sample size By adding other independent variables that affect wins By adding lagged variables By adding dummy variables