To avoid demand characteristics,researchers frequently use __________ to keep their participants unaware of the purpose of the experiment.
A)random selection
B)placebos
C)double-blind designs
D)deception

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The Answer of To avoid demand characteristics,researchers frequently use __________ to keep their participants unaware of the purpose of the experiment.
A)random selection
B)placebos
C)double-blind designs
D)deception

To Avoid Demand Characteristics,researchers Frequently Use __________ to Keep Their