To assess the effect of televised violence on aggression, researchers plan to expose one group of children to violent movie scenes and another group to nonviolent scenes. to reduce the chance that the children in one group have more aggressive personalities than those in the other group, the researchers should make use of

Random assignment

Explanation:

Based on the specifications of the study and the researchers goal, it can be said that in order to reduce the chance that the children in one group have more aggressive personalities than those in the other group, the researchers should make use of Random assignment. This refers to using a randomized protocol in order to assign individuals randomly to each group, thus ensuring that each individual would have the exact same probability of being assigned to a specific group. This would prevent children with certain similar traits to be assigned to the same group because of those traits/personality.