Knowledgeable and unbiased observers have generally noted, and ...

[fasfsadfdsfa]

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

[alexanderhamilton]

Answer to Question 1

C

Answer to Question 2

D