8.2 Review

A researcher randomly assigned students to two groups. One group was assigned to watch a violent television program while the other group watched a nonviolent program. The student's behavior was then recorded for incidences of aggressive behavior. Which research method is most appropriate?

• experimental

• observational study

• sample survey

• none of these

Dr. Larson was interested in whether classical music helps students perform better on a test. Dr. Larson randomly assigned half of the study's participants to a group that listened to classical music while taking a test. The other half of the participants did not listen to music while taking a test. Which research method is most appropriate?

• experiment

• sample survey

• observational study

• none of these

Jane Goodall lived among wild chimpanzees intermittently for decades, studying their social and family systems while keeping her interaction with the chimpanzees to a minimum. Which research method is most appropriate?

• experiment

• sample survey

• biased study

• observational study

A psychologist designed a study to test the effects of cell phone use on driving safety. Participants were randomly assigned either to drive an automobile simulator while talking to a friend on a cell phone or to drive a simulator without talking on a phone.

• none of these

• Experiment

• Sample Survey

• Observational Study

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group.

• Sample survey

• Observational study

• Experiment

• Neither

A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym. Is this sample biased or unbiased?

• Unbiased

• Not able to be determined.

• Biased

Ghala wanted to know what the most popular book was in the whole school, so she asked everybody in 11th grade what their favorite book was. Which research method is most appropriate?

• Sample Survey

• None of these

• Biased Sample

• Experiment

A researcher stood at a school parking lot entrance to see if the color of a car is related to the driver not wearing a seat belt.

• Observational Study

• Experiment

• Sample survey

• None of these

Four groups of randomly selected people are assigned a different diet. After six months, the blood pressures of each group are compared.

• Experiment

• None of these

• Observational Study

• Sample Survey

Interview every 10th student who enters the school in the morning.

• convenience

• self-selected

• systematic

• simple random