What percentage of 15-year-old males engage in masturbation, and what percentage of 15-year-old girls engage in masturbation, respectively?

Which of the following statements about depression is most accurate?

a. Rates of major depressive disorder are higher among adolescents than rates of depressed mood. b. Psychotherapy alone was as effective in treating adolescent depression as psychotherapy combined with medication. c. Rates of depressed mood rise substantially from middle childhood to adolescence. d. Boys are more likely than girls to show increases in depressed mood during adolescence.

You are taking a university course with a combined graduate and undergraduate enrollment. You know that there are many more undergraduate than graduate students enrolled in this course. There is a woman who looks to be about thirty sitting next to you

If you use only the base rate to guess her student status, you would guess that she is a(n) ________ student because ________. a. graduate; she's older b. undergraduate; you have a bias to expect undergraduates in your courses c. graduate; she fits your schema for graduate students d. undergraduate; there are more of them enrolled in the class