If a particular test "X" has been shown to accurately predict success in a particular job, then the test is said to be

a. valid

A psychologist spends her entire career studying how and why changes occur in people throughout their lives. This psychologist is most likely working in the field of __________

a) abnormal psychology. b) gerontology. c) human development. d) maturational studies.

Which of the following statements about the sexual behavior of U.S. adolescents is true?

A) Boys tend to have their first intercourse earlier than girls. B) Few young adolescents are sexually active. C) At the end of high school, boys report higher rates of having had sexual intercourse than girls. D) U.S. youths become sexually active later than their Canadian and European counterparts.