Various research methods that are used by psychologists.

Elena is a psychologist interested in understanding the impact of a sense of control on stress in humans. She brings in students from around campus and gives them a number of choices (increasing sense of control) before exposing them to a very difficult math test. She brings in another group of students and does not give them any choices before giving them the math test. She uses the scores earned by the two groups to see if those students given choices before the test do better than the students who did not get choices. Which research method was used (case history, survey, naturalistic observation, psychological tests, laboratory observation, or experiment)? Identify the information in the scenario that supports your reasoning. What ethical guidelines would need to be followed to conduct this study? Which basic ideas behind early approaches in psychology most closely align with this method?