In experimental research on humans, the independent variable is
a. some form of stimulus presented to the subjects
b. under the full, active control of the experimenter
c. the potential causal half of the cause-and-effect relationship
d. all of these
d
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Why is it important to study identical twins who are reared together in the same environment?
A. That's the way to determine the effects of genetics on both twins. B. When genetically identical twins are raised in the same environment, the influence of their genetic makeup is more powerful. C. Identical twins reared together are far easier to locate than those reared separately. D. Twins raised together must be compared to those raised separately to determine the relative effects of genes and environment.
Hegarty (1992) argued that when people have a complex problem to solve, they use mental imaging regardless of whether someone tells them to do so.
Answer the following statement true (T) or false (F)
Police candidates who do poorly on screening evaluations are eliminated from the pool of trainees and potential employees.
Answer the following statement true (T) or false (F)
A study that explored the utility of diagnostic X-rays in routine screening of children at risk for child abuse concluded that there was most utility in
A. a four-view series of X-rays. B. one X-ray combined with visual examination. C. a two-view series of X-rays. D. visual examination only.