A psychologist, studying pilot trainees, picks a select group of trainees who are hopefully representative of all other trainees. The group of trainees being studied by this psychologist are collectively known to researchers as a ______

In a study comparing the living arrangements of older adults in 43 countries, rates of living with children were highest in _____

a. Africa b. North America c. Asia d. Australia

Individuals use psychological defense mechanisms in order to

a. aid one's understanding of self. b. prevent psychosomatic illnesses. c. reduce depersonalization. d. reduce anxiety.