In his study on the relation between optimism and exercise, Huck found a positive correlation that was explained by the observation that having a large social network caused people to be optimistic and to exercise. Therefore, social network size was a(n):

The classical and dimensional approaches to nosology differ in that

a. the classical approach uses categories, and the dimensional approach uses prototypes. b. the classical approach uses prototypes, and the dimensional approach uses profiles. c. the classical approach diagnoses based on the presence of symptoms, and the dimensional approach notes the degree of severity of symptoms. d. the classical approach places individuals in categories, and the dimensional approach places symptoms in categories.

A person who has lived all her life in New York City would probably find life in the country ________, according to the ________ theory of motivation

a) boring, optimum-level b) boring, drive-reduction c) interesting, optimum-level d) interesting, drive-reduction