The psychology family tree includes two major roots: ____

Jessie is an adolescent in Arizona. By the end of high school, he had experimented some with substance use. It is unlikely that he tried which of the following substances?

a. alcohol b. marijuana c. heroin d. cigarettes

A psychologist visiting a classroom concludes that one of the children is depressed because the child is quiet and unresponsive. Actually, the child has the flu. The psychologist has made what error?

a. failure to distinguish correlation from causation b. failure to distinguish inference from observation c. failure to use experimental controls d. failure to obtain a representative sample