If you suspect that the groups in a nonequivalent control-group design differ on variables other than the dependent variable, you should
A) systematically identify potential confounding variables.
B) measure the variables that may be confounded.
C) carefully rule out the alternative hypotheses.
D) All of the above
Answer: D
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Which theory of why humans fight wars aligns most closely with Darwin's theory of survival of the fittest?
a. Violence is hardwired into human nature. b. Violence is derived from cultural practices. c. Violence is a product of governmental institutions. d. Violence is the product of an anarchical international system.
Which of the following provides one explanation for why Medicare costs have risen in recent years?
a. People now are in better health than were people in the past. b. People rely on their own private insurance to supplement Medicare. c. Doctors charge less for many services than they did in the past. d. People live longer today than they did in the past.