A soccer coach wanted to improve the teams playing ability s

A soccer coach wanted to improve the team\'s playing ability, so he instructed the players to run two miles a day. At the same time the players decided to take vitamins without the coach\'s knowledge. In two weeks the team was playing noticeably better. Identify the confounding variable in this situation.

Solution

A soccer coach wanted to improve the team\'s playing ability, so he had them run two miles a day. At the same time the players decided to take vitamins. In two weeks the team was playing noticeably better, but the coach and players did not know whether it was from the running or the vitamins.

confounding variable is that the coach dont know that the players decided to take vitamins