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4. A school psychologist is planning to study the effect of a new anger management program on the aggressive behavior of students at her high school. She knows that the mean number of aggressive behaviors at her school is 14 per week, with a standard deviation of 3.2, but she would like to cut this number in half to 7 events per week as a first benchmark goal of the anger management program. What is the predicted effect size for this projected decrease in aggressive behaviors?

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