An individual at the 75th percentile would have a z score of approximately _____

Clark Hull developed a systematic theory of learning based on the concept of

a) classical conditioning. b) drive reduction. c) the law of effect. d) overt behavior.

Studies on stress and the immune system firmly suggest that

a. a sense of hope can reverse a terminal illness b. stress weakens the immune system, making us more susceptible to illness c. depression has little effect on the immune system d. the lack of sufficient "will power" is definitely a cause of cancer