4. 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, there was a sale on Bobo Dolls the week before the study began, with a big advertising campaign on TV that showed kid actors hitting a Bobo Doll. When asked about the Bobo Doll after the study, most kids in the study said they had seen the ads and were excited to see a Bobo Doll from the ad in the activity 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. Diffusion j. No Threat