Travis is comparing the effects of upbeat music and slow music on task productivity. His research assistants tell him they reall
y enjoy the upbeat music condition. Imani is doing a study on sociability in college students,with participants either one-on-one or in small groups. She later finds out that one of her research assistants is much chattier than the others. Marcos is testing how performance in video games affects aggression; he randomly assigns participants to play either an easy video game or a difficult video game. Some of his participants have never played video games before. Shilpa wants to measure the positive effects of shopping online versus shopping in person. She recruits participants from a message board focused on online shopping and randomly assigns them to either buy three things online or three things in a store and then complete her shopping attitude scale_________. A. Unsystematic
B. Variability
C. Systematic
