In an experiment, a researcher manipulates one variable to see how it affects a second variable. The manipulated variable is called the:
a. dependent variable.
b. experimental variable.
c. independent variable.
d. placebo.
c
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Which of the following is NOT one of the types of attachment proposed by Mary Ainsworth?
a. resistant attachment b. secure attachment c. avoidant attachment d. intense attachment
Zoelch, Seitz, and Schumann-Hengsteler (2005) used a variety of tests to examine the central executive of working memory. They found
a. solution times increased with age for all tasks b. recall accuracy decreased with age for recall tasks c. number of correctly fused objects decreased with age d. the random generation task showed few age differences
The most abused form of amphetamines is ____
a. ?PCP b. ?methamphetamine c. ?marijuana d. ?cocaine
Of the common specific phobias listed, which is the most common among Americans?
a. fear of insects, birds, snakes, and other animals b. fear of airplanes c. fear of closed spaces d. fear of storms, thunder, and lightning