Using a Sample of 300 Children Aged 10 to 12

Multiple Choice

Using a sample of 300 children aged 10 to 12 years old, a child psychologist examines how scores on a "violent behaviors" index relate to gender and amount of television watching per day (less than 2 hours, 2 to 4 hours, more than 4 hours) . In his report, the psychologist writes, "The effect of the amount of television watching on the violent behaviors index was more pronounced for males than for females." The sentence quoted in the previous sentence indicates that

A) amount of television watching and gender are interacting variables.
B) amount of television watching and gender are confounding variables.
C) there is a main effect of gender.
D) amount of television watching and the violent behaviors score are not related.