An experiment is conducted to investigate the effects of three different doses of a drug (low, medium, high) on reaction time. The null hypothesis is that
a. The low dose leads to faster reaction times
b. The high dose leads to faster reaction times
c. There is no difference between the reaction times associated with the three doses
d. There is a difference between the reaction times associated with the three doses
c
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Marcella is interested in studying the physical development of girls between 7 and 10 years of age. It is impractical to think that she could study every such girl in the country, so instead she selects a smaller group of girls in this age range to study. The group that Marcella studies is a(n) ________, and the larger group that they represent is a(n) ________
a. population; sample b. out-group; in-group c. in-group; out-group d. sample; population
When the goal of research is to establish a cause-and-effect relationship, the only method available is . . .
a. Collecting many observations b. Observing a correlation between the cause and the effect c. Observing that when the cause is absent, the effect is absent d. None of the above
Classical conditioning most often explains the ____ aspect of an attitude
a. ?emotional b. ?emotional c. ?cognitive d. ?information
Varenicline, approved in 2006 for smoking cessation
A. is also used as an antidepressant. B. is an opioid antagonist. C. is a partial nicotinic-receptor antagonist. D. blocks the metabolism of nicotine.