Personality variables linked to volunteerism may help recruiting volunteers.

Monozygotic twins __________

a) are genetically identical. b) are genetically different. c) will be of different sexes. d) are more likely to occur when a woman is taking fertility drugs.

You are a member of the next generation of social psychologists. If you follow Lewin's advice (1946, as presented in your text), your research questions can best be tested using

a. common sense and intuition. b. observation. c. correlational designs. d. the experimental method.