Dr. Tarbell is carrying out an experiment where he is studying the effects of the drug Ritalin, a drug used to treat hyperactivity, on the behavior of a group of hyperactive children and a second group of non-hyperactive children
Both groups of children were tested for hyperactivity before and after taking the drug, which represented the second independent variable. The results indicated that the hyperactive children were less hyperactive after taking the drug than before taking the drug; the non-hyperactive children, however, were more hyperactive after taking the drug than before taking the drug. This type of a result is referred to as a(n)
a. main effect.
b. interaction effect.
c. extraneous effect.
d. non-scientific effect.
b
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According to Freud, the unconscious is
a. the thoughts, wishes, feelings, and memories, of which we are largely unaware b. a set of universal concepts acquired by all humans from our common past c. a reservoir of deeply repressed memories that does not affect behavior d. the part of personality that cannot process information
One explanation of aging cites our dietary habits as connected to the aging process. Which statement below is NOT consistent with this theory?
a. What we eat is the most significant contributor to aging. b. To receive the maximum benefits of caloric restriction, humans would have to reduce their caloric intake by 30%.. c. Animal research supports an association between reduced caloric intake and increased longevity. d. "Natural" human studies suggest that individuals on restricted diets may live longer.