Jayshawn is conducting a research study for his psychology course. he is studying whether playing violent video games causes children to engage in aggressive acts afterwards. he randomly assigns children to two conditions: one group receives a violent video game to play for a half-hour and another group of children receives no video game to play. he then measures their tendency to act aggressively by having them play with a bobo doll (punching bag) and recording their aggression toward the object. the number of times the children punch the bobo doll is referred to as the ______ in this expierment