Assignment task: Two different studies are conducted to investigate the TV watching and children's aggression:
STUDY A: Children are randomly assigned to two groups. One group is assigned to watch ten hours of TV a week; the other watches no TV. The researchers then measure the children's aggression on the playground. The children in the TV watching group exhibit more aggression than the children in the no TV group.
STUDY B: Researchers ask parents to report on the amount of time their child watches TV in a typical week. The researchers then measure the children's aggression on the playground. The children who watch high amounts of TV also exhibit higher levels of aggression on the playground.
What kind of study is Study A? Why?
What can you conclude from the results of Study B?