In using inferential statistics we should initially assume that in any experiment, the scores
obtained from different groups of participants
a. will reflect all possible differences between the groups.
b. will be due only to the manipulation of the independent variable.
c. should be statistically significant.
d. will be different simply due to chance.
e. will only be different if the groups have been subjected to different conditions.
d. will be different simply due to chance.
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In the 1980s, political scientist James Flynn observed that the IQs of Americans were rising at a rate of about _____ point(s) per decade
A) 1 B) 2 C) 3 D) 4
According to the Consumer Reports survey, which of the following is accurate?
a) Individual psychotherapy works best for every type of disorder. b) The longer a person stays in therapy, the greater the improvement. c) Overall psychotherapy without drugs is not as effective as psychotherapy with drugs. d) Group therapy is more effective than individual therapy in treating a wide range of disorders.