A psychologist discovers a correlation between parents who smoke cigarettes and juvenile delinquency in their children. We can conclude that
a. parental smoking causes juvenile delinquency.
b. juvenile delinquents drive their parents to take up smoking.
c. both parental smoking and juvenile delinquency are caused by a third factor, such as socioeconomic status.
d. parental smoking and juvenile delinquency are related, but no causal relationship has been established.
ANSWER: d
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