Aresearcher was interested in examining the claim that physically releasing one’s anger to alleviate it. 20 people with anger management problems were randomly assigned to 1 of 2 groups. in group 1, they were instructed to punch a pillow when angry. in group 2, they were instructed to journal their thoughts. their anger was measured with the anger expression inventory.1. what is the independent variable? 2. what is the dependent variable? 3. how is the dependent variable operationalized? 4.what is the experimental group?