DSM-5 follows a(n) ________ approach to classification, grouping diagnoses on the basis of similar, observed symptoms

The belief that all behavior is learned as a result of experiences of interactions with the environment is known as:

a. naturalism b. cognition c. behaviorism d. psychodynamism

Dr. Wilkins randomly assigns subjects to one of two groups. He is interested in the effects of caffeine on anxiety levels. He gives subjects in the first group an extra two cups of coffee a day for six months

The second group receives an extra two cups of decaffeinated coffee a day for the same time period. Importantly, subjects do not know whether they are being given regular or decaffeinated coffee. By providing one group with decaffeinated coffee, Dr. Wilkins is trying to account for which potential element of the experiment? A) participant fraud B) inter-rater reliability C) the placebo effect D) variability