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What Does It Mean to Have a "Double-Blind" Trial

Question 4

Multiple Choice

What does it mean to have a "double-blind" trial?


A) The participant doesn't know whether or not they are receiving the treatment of interest
B) The researcher doesn't know whether or not the participant is receiving the treatment of interest
C) Neither the participant or the researcher knows whether or not the participant is receiving the treatment of interest
D) Both the participant and the researcher know whether or not the participant is receiving the treatment of interest

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