In preparation for a study of the effectiveness of an antischizophrenia drug, an experimenter puts the experimental drug and the placebo into capsules of the same color and codes them. Neither the subjects nor the experimenter will know who gets the experimental drug or the placebo. This is an example of a:

Most sociologists agree that: a. culture is central in shaping gender roles, but only in preliterate societies. b. biological factors have some influence, but cultural factors are more important determinants of gender roles. c. biological factors are influential in determining gender roles, but only in industrial or complex societies. d. biological factors only explain differences between men and women with regard to aggression and disease. e. there is no difference between the influences of culture or biology on the development of gender roles, as they are unpredictable.