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littlescientist littlescientist
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6 years ago
One way to prevent experimenter bias is to be sure that the experimenter and the participants know nothing about who is receiving the experimental treatment and who is not. This is known as ____.
 
  a. experimenter design
  b. the placebo effect
  c. a random assignment of variables
  d. a double-blind design
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wrote...
6 years ago
ANSWER:
d
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