In this scenario, the experiment has used a Double-blind technique.
In a double-blind trial, neither the volunteers nor the researchers are aware of who is receiving a certain treatment. This process is used to guard against bias in research findings. For the purpose of avoiding bias brought on by demand characteristics or the placebo effect, double-blind trials are especially helpful. Let's say, for illustration, that scientists are looking into the effects of a novel medication. The researchers who interact with the patients in a double-blind study would be unaware of who was receiving the real medication and who was receiving a placebo.
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