A DSM-5 diagnosis of bulimia nervosa requires that binge-eating episodes occur at an average frequency of at least once a week for three months

_____ refers to tangible and/or emotional support provided in a time of need by family members, friends, and others

a) Hardiness b) Optimism c) Proactive coping d) Social support

Daniel conducts a study looking at the relationship between exercise and depression and finds there is a negative correlation. Daniel concludes that exercise causes people to become less depressed

However, a colleague points out the possibility that less depressed people may simply be more likely to exercise. This represents a problem in interpreting correlations best known as ____________. a. The problem of direction b. The third variable problem c. Experimenter bias d. Confounding