________ is a necessary element of virtually all aggression

Which of the following statements regarding adolescent contraceptive use is FALSE?

A) Some teens believe that they do not need contraceptives if they do not have sex frequently. B) Most teens report that they know where to get contraceptives and that they are easily available. C) The best predictor of contraceptive use is age—older teens are more likely to use contraception. D) Some teens do not use contraception because they are afraid that their parents will find out.

If you conducted a multi-group study, you might want to see which groups differ from one another significantly. If you know in advance of your analysis which groups you want to compare, what test would you use?

a. Multiple t-tests b. Post hoc comparisons. c. Planned comparisons. d. Repeated measures tests.