A recent survey by a large-circulation Canadian magazine on the contribution of universities to the economy was circulated to 394 people who the magazine decided "are the most likely to know how important universities are to the Canadian economy." The main problem with using these results to draw conclusions about the general public's perception is
a. insufficient attention to the placebo effect
b. response bias
c. no control group
d. lack of random selection
e. lack of random assignment
Answer: lack of random selection
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