Research indicates that people who live in unsophisticated, non-technologically based cultures are incapable of attaining the formal operational stage of thinking, as described by Piaget

The statistic formulated by adding a group of scores together and then by dividing that sum by the total number of scores is called the

a. median. b. mean. c. mode. d. variance.

Clinical psychologists study __________

a. how people's personalities changes as they grow older b. the relationship between personality traits and mental health c. the personality traits of good workers d. if we can see personality in the structures of the brain