John's behavior provides an excellent example of Antisocial Personality Disorder. As such, Dr. Marek has spent several years intensively studying John, his symptoms, and the changes in his symptoms that occurred during therapy. However, Dr. Marek cannot assume that what is true for John will also be true for others, because ____________________.
a. double-blind studies like this one do not provide reliable findings
b. experiments need to be conducted on populations, not samples
c. correlational studies lack validity
d. case studies should not be generalized to populations
d. case studies should not be generalized to populations
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