To prevent the possibility that a placebo effect or researchers' expectations will influence a study's results, scientists employ

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The double-blind procedure is specifically designed to prevent the placebo effect or researchers' expectations from influencing a study's results. In this procedure, both the participants and the researchers involved in the study are unaware of which group is receiving the treatment or placebo. This helps ensure that any observed effects are due to the treatment and not other factors. Control groups and experimental groups and random assignment are important aspects of experimental design but do not directly address the issue of placebo effects or researchers' expectations.

To Prevent the Possibility That a Placebo Effect or Researchers