Which of the following best describes a double-blind experimental procedure?
Correct answer: C. Half the subjects get the experimental procedure, half the placebo; which they receive is not known to subjects or experimenter
- A. All subjects get the experimental procedure
- B. Half the subjects get the experimental procedure, half the placebo, which they receive is known only to the experimenter
- C. Half the subjects get the experimental procedure, half the placebo; which they receive is not known to subjects or experimenter
- D. All subjects get the control procedure
Explanation
In a double-blind experiment, neither the participants nor the experimenter dealing with them knows who receives the treatment and who receives the placebo. This reduces both participant expectancy effects and experimenter bias.
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