To Test Whether People in Bars Drink More When They

Multiple Choice

To test whether people in bars drink more when they are in groups than when they are alone, researchers visited all the pubs in a city. They ordered beers and recorded observations on napkins and pieces of newspaper. Why did they keep their identities in disguise?

A) They were conducting a double-blind study.
B) They wanted to make sure the study had test-retest reliability.
C) They needed to determine the experimenter effects in the study at a later point in time.
D) They wanted the people they were observing to behave naturally.