Which type of performance curve is considered "normal" or "standard" when learning a most skill?

Epidemiologists have a difficult time pinning down the prevalence of personality disorders because

a. there is considerable overlap among categories in these disorders. b. there are too many dimensions to be measured. c. there is no agreement on the criteria for personality disorders. d. they are so rare.

Observational learning theory's foremost proponent is

a. Watson. b. Thorndike. c. Skinner. d. Bandura. e. Tolman.