As part of an experimental study on neuropeptides and their effect on emotions, Hilda administers a certain chemical to a group of teenagers, which has been chosen as the sample. The effects of this chemical include a feeling of elation and a need for affiliation. The group of teenagers considered for research exhibits a need to socialize more with the people on campus. Which of the following is the group of teenagers likely to have been given?

Researcher expectancy is a problem because

a. researchers are much more likely to expect gender differences in cognitive ability than gender differences in social behavior. b. researchers' stereotypes may influence the way that the participants respond. c. it reduces the probability of finding results that have practical significance. d. it reduces the number of confounding variables.

The operant technique used to help formerly hospitalized patients live in communities is

a. successive approximations. c. social skills training. b. exposure therapy. d. rapid socialization.