A consumer magazine surveyed people who had sought
a psychologist’s help with a personal problem. Of those
responding who had received treatment for 6 months or
less, 20 percent claimed that treatment “made things a
lot better.” Of those responding who had received longer
treatment, 36 percent claimed that treatment “made
things a lot better.” Therefore, psychological treatment
lasting more than 6 months is more effective than
Which one of the following, if true, most seriously
weakens the argument?
(A) Of the respondents who had received treatment
for longer than 6 months, 10 percent said that
treatment made things worse.
(B) Patients who had received treatment for longer
than 6 months were more likely to respond to
the survey than were those who had received
treatment for a shorter time.
(C) Patients who feel they are doing well in
treatment tend to remain in treatment, while
those who are doing poorly tend to quit earlier.
(D) Patients who were dissatisfied with their
treatment were more likely to feel a need to
express their feelings about it and thus to
return the survey.
(E) Many psychologists encourage their patients to
receive treatment for longer than 6 months.
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