Multiple Choice
When an experiment includes a placebo group, why should researchers use a double-blind procedure?
A) The double-blind procedure controls for experimenter expectation.
B) An experimenter may treat control and treatment groups differently, thus influencing their behavior.
C) An experimenter may record and interpret the two groups' behaviors differently.
D) All the answers are correct.
Correct Answer:
Verified
Correct Answer:
Verified
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