In experimental studies, the __________ group receives the treatment or manipulation, while the __________ group does not.
a. experimental; control
b. control; experimental
c. experimental; quasi-experimental
d. quasi-experimental; control
Question 2
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.
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