Questions 25 refer to the following situation: Psychologist Gomes tested the hypothesis that giving sensitivity training to parents helps raise the selfesteem of their adolescent children. He randomly assigned 10 sets of parents to a sensitivity training group or a control talkonly group. Before and after 12 weekly sessions he gave their adolescent children a test of self-esteem. What kind of study is it? 0 a. descriptive O b. quasi-experiment O c' correlational 0 d. true experiment