A Researcher Investigated the Relationship Between Fraternity Membership and Drinking

Multiple Choice

A researcher investigated the relationship between fraternity membership and drinking. He surveyed the members of 10 fraternities (250 men) and found that 80% agreed with the statement "I drink more than the average college student." The researcher concluded that fraternity membership contributes to excessive drinking. Based on the information given here, a problem with this study is that

A) the sample size was too small.
B) the measure of drinking was unreliable.
C) there is no control or comparison group.
D) fraternity membership and self-reported drinking are confounded.