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maan maan
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6 years ago
A double-blind procedure relates to
 
  a. a bias correction involving two researchers.
  b. a bias correction involving two research subjects.
  c. a bias correction involving researcher and research subjects.
  d. two messages, one of which contradicts the other.
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Trinh V.Trinh V.
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6 years ago
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maan Author
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6 years ago
Brilliant
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Thanks for your help!!
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2 hours ago
You make an excellent tutor!
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