For each of the following scenarios, identify which research strategy is used: descriptive, correlational, experimental, or nonexperimental. (Note: For now, do not differentiate between nonexperimental and quasi-experimental studies. The distinction between them is discussed later)
1D) Dr. Jones conducts a study examining aggressive behavior of 5-year-old boys. Each afternoon for 1 week, a group of boys in a child-care center is observed during a 30-minute period while they play outdoors. Aggressive behaviors are recorded during the 30-minute period.