1. The study was set for the first two weeks of the semester so that students would be less familiar with the rules regarding how children should behave at school. The children were randomly assigned to one of three conditions. Unfortunately, the researchers ran the aggressive model condition first, and although they asked the kids to not mention the study details to any of their classmates, many of these children did so anyway (eagerly talking about "Boxing with the Bobo Doll!"). Many students assigned to the neutral model and no model conditions thus knew about the presence of the Bobo Doll in the activity room and actively looked for it when they entered the room. Researchers failed to confirm the prediction that children exposed to an aggressive role model would receive higher ratings of both observed and self-rated aggressiveness than children exposed to a neutral role model or to no role model, with children exposed to a neutral role model having lower observed and self-rated aggressiveness scores than children exposed to no role model. a. Maturation b. Regression to the mean c. Selection d. Mortality e. Instrumentation f. Testing g. History h. Interactions i. j. Diffusion No Threat