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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The study of memory, emotion, and intelligence is an example of
A) non-empirical research. B) the study of observable facts. C) the study of non-observable variables. D) a study of specific behavioral events.
By 2010, the number of people self-identifying with multiple races had increased to about ______ Americans.
a. 1 million b. 3 million c. 6 million d. 9 million