Determining the nature of the relationship between cognitive impairment and the prolonged use of amphetamines can be difficult because
A) amphetamines don't actually cause brain damage.
B) people taking amphetamines refuse to be tested.
C) researchers cannot determine the cause-and-effect relationship between cognitive impairment and amphetamine use from correlational data.
D) there are no known long term risks associated with these drugs.

Question

Quizplus · Accepted Answer

Correlational data can only show a relationship between two variables, but it cannot determine causation. Therefore, it is difficult to determine whether amphetamine use causes cognitive impairment or whether people with cognitive impairment are more likely to use amphetamines.

Determining the Nature of the Relationship Between Cognitive Impairment and the Prolonged