Knowledgeable and unbiased observers have generally noted, and studies have reliably shown, that psychotherapy is better than no treatment at all for a person who is seriously depressed. My study failed to find a difference. From this I can conclude that
a. psychotherapy really is not effective.
b. my study must have been poorly done.
c. my study may have lacked sufficient power to find a difference.
d. other psychologists don't know what they are talking about.
Question 2
The measure of the effect size for the difference between two groups is best seen as
a. the difference in their means.
b. .
c. the ratio of the means.
d. all of the above
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