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. 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

Explanation:

Random assignment is an experimental technique for assigning subjects to different treatments. The thinking behind random assignment is to randomize the treated assignments, then the group assigns for the different treatments will be roughly equivalent and therefore any observed effect between treated groups may be linked to the treatment effect and is not a characteristic of the individuals in the group. Random assignment can be used to assess the effect of television violence on aggression because random assignment reduces the chance that children in one group will have more aggressive personalities than those in the other group.