Which of the following is the index of how much a typical score differs from the mean of a group of scores?

When researchers asked people to rate cartoons for funniness, they found that

A. each participant experienced a cathartic release of tension. B. cartoons with sexual and aggressive themes were rated as funnier than cartoons with other themes. C. the likelihood of participants acting aggressively significantly increased. D. funniness ratings were inconsistent with predictions from Freudian theory.

The tendency to perceive an object as being just as bright in varying amounts of light is called

a. an illusion. c. brightness constancy. b. a monocular cue. d. color constancy.