According to Happenstance Learning Theory, most adults found their careers through

Which one of the following statements is accurate concerning gender differences and the diagnosis and treatment of attention-deficit hyperactivity disorder?

a. Boys are diagnosed and treated more frequently than girls. b. Girls are diagnosed and treated more frequently than boys. c. There are no gender differences. d. Boys are more likely to be diagnosed, but girls are more likely to receive treatment.

Of the following subject variables, which variable is least likely to be selected by an researcher conducting a psychological experiment?

A) Gender B) Race C) Species D) Sexual orientation