1. The cheerleaders for a high school football team do their best to inspire players and fans during games. Because of travel expenses, the cheerleaders weren't able to attend 3 of the team's road games. The team lost these 3 games, but won 6 of their other 8 games. Assume that this difference provides convincing evidence that the team's ability to win games is greater when the cheerleaders are in attendance.
2. List several possible differences between the two sets of games that might be the difference in the team's ability to win games.
3. Explain how confounding makes it impossible to determine if the cheerleaders caused the increase in their ability to win.