Final answer:
The principal's report indicates that children who play video games exhibit more violent behaviors per week than children who do not play video games.
Step-by-step explanation:
The principal's report suggests that children who play at least 30 minutes of video games per day exhibit more violent behaviors per week than children who do not play video games. This conclusion is supported by the findings of psychologists Anderson and Bushman, who have conducted extensive research on the subject. They have found that playing violent video games can lead to an increase in aggressive thoughts and behaviors in children.