Researchers should attempt to use heterogeneous, random samples that are representative of the general population in order to avoid problems with internal validity

Which of the following verbs is not appropriate for describing

an informative presentation? a. explain b. influence c. instruct d. clarify e. describe

A learned predisposition to respond favorably or unfavorably toward something is

A) a value. B) an attitude. C) a belief. D) a reason.