When Western parents choose to practice __________, amount of crying in the early months is reduced by about one-third

Twin and adoption studies are helpful for assessing the ________ of intelligence.

a. predictive validity b. reliability c. heritability d. standardization e. content validity

Phillip has repeated and intense sexual urges to rub his genitals against women in crowded subways. He is probably suffering from:

A. voyeurism. B. exhibitionism. C. sexual sadism. D. frotteuristic disorder