In any given year, at least _____ percent of people with schizophrenia and other severe mental disorders receive no treatment.

A reliable operational definition is

a. never valid. b. not always valid. c. always valid. d. valid as long as the procedure used in the study is valid. e. valid as long as an appropriate sample is used in the study.

Each of the following is true of Plutchik's theory of emotions EXCEPT ______

a. it appears to apply equally well to people of all cultures b. each of the emotions he describes helps us to adjust to the environment in different ways c. different emotions can be combined to produce a wider range of emotional experiences d. emotions adjacent to each other on Plutchik's "circle" are more alike than emotions situated opposite each other