The 2009 National Survey on Drug Use and Health Selected

Multiple Choice

The 2009 National Survey on Drug Use and Health selected a random sample of U.S.college students and asked them about illicit drug use.Roughly 23% of the students surveyed reported using illicit drugs in the past year.The variable in this study is:

A) the percentage of students who reported using illicit drugs.
B) whether or not a student used illicit drugs.
C) whether or not a college student responded to the survey.
D) the number of college students who use illicit drugs.