A supervisor noticed that absenteeism was higher on the Tuesday following a Monday Night Football game than on other days. To test her idea, she counted the number of days her employees missed on Tuesdays not following a football game and compared them with the number of days missed on the Tuesdays following a football game. She found that the absenteeism rate was 10% on "regular" Tuesdays and 25% on Tuesdays following a football game. Type of study Independent variable Dependent variable Problems and suggestions