Question: In a study of modeling, one group of 20 children saw an adult acting aggressively on videotape. Another group of 20 children saw the same adult acting aggressively in real life. Later each child was placed in a room where he or she was given the opportunity to behave aggressively toward a Bobo doll (a human like dummy). The researchers recorded the number of aggressive acts toward the Bobo doll by each child in a 15 minute period. Here are the results:

Real Life Model Video Model

X f x f

Compare the two groups in terms of the aggressiveness displayed. If you reject the null hypothesis, tell what it means in the context of the problem.