When two or more groups are present in an experimental design, and in order to help avoid any systematic variation other than that caused by the independent variable on the behavior of interest, the researcher
a. randomly assigns participants to groups.
b. provides a different independent variable for each group.
c. measures a different dependent variable for each group.
d. assigns the same subjects to all groups.
A
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Which of the following statements about drinking alcohol is TRUE?
A) The majority of sexual assaults involving youths occur when at least one person is drunk. B) Currently the drinking age in all fifty states is age 21. C) Adolescents who don't begin to drink until they are 21 tend to drink less as adults than those who started earlier. D) all of the above
Results of Jerome Kagan's longitudinal research on the development of shyness and sociability found that
A) about 70 percent of 4-month-olds were easily upset by novelty. B) nearly all of the extreme groups retained their temperamental styles as they get older. C) most children's dispositions became less extreme over time. D) as infants, more children were shy than were highly sociable.