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Ftariq92 Ftariq92
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6 years ago
The double-blind experiment is useful because
 
  a. both the subjects and researchers know the experimental and control groups.
  b. neither the subjects nor the researchers know the experimental and control groups.
  c. only the researcher knows the experimental and control groups.
  d. there are no control groups in double-blind experiments.
  e. there are no experimental groups in double-blind experiments.
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