Problem: To study the effects of alcohol consumption on aggression in video game play, Dr. Tam tested a sample of 21-year-old men. He studied the number of aggressive responses that the men displayed while playing the video game, Mortal Combat, after they had just drunk either 4, 2, or 0 ounces of alcohol. In this study, the independent variable consisted of the aggressive responses of the research participants. the video game. Mortal Combat