One of the primary techniques for reducing both the placebo effect and experimenter expectancy effects is random selection.

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Random selection refers to the process of choosing participants in a study in a way that every member of the population has an equal chance of being included. This helps to reduce selection bias, but it does not directly address the placebo effect or experimenter expectancy effects. Other techniques, such as blinding and double-blinding, are often used to minimize these effects in research.

One of the Primary Techniques for Reducing Both the Placebo