Suppose you perform an experiment that compares the performance of an experimental group and a control group. You find that the mean of the experimental group is higher than the mean of the control group
Does this prove that the treatment enhanced performance?
a. Yes, because the experimental group did better as a whole than the control group
b. No, because you must compare variances, not means
c. No, because the difference between the group could have occurred by chance, even if it was not very likely (i.e., less than .05)
d. Yes, because group averages are the traditional measure to use to compare two groups
C
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Changes in Eastern Europe in the past decade have been most apparent in the growth of
A. trade unions. B. anomic groups. C. associational groups. D. class-based interest groups.
What distinguishes a means-tested program from a social insurance program?
A. A means-tested program extends benefits based on age categories, while a social insurance program provides benefits based on immediate need. B. A means-tested program only extends benefits to the elderly, while a social insurance program extends benefits to everybody. C. A social insurance program provides benefits based on demonstrated need, while a means-tested program provides benefits based on lifetime contributions. D. A social insurance program provides benefits based on lifetime contributions, while a means-tested program provides benefits based on demonstrated need.
According to the text, the best single indicator of a state's power may be the size of its __________
A) army B) air force C) population D) total GDP
Low-constraint research enables us to obtain useful information about
A) Techniques for manipulating variables. B) Causality. C) Relationships among variables. D) Making and testing predictions.