Commonly used in drug-evaluation studies,________ ensures that research participants' belief in a drug's healing powers will not bias the results.

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The double-blind procedure is designed to eliminate bias in drug-evaluation studies. Both the researchers and participants are unaware of who is receiving the actual drug and who is receiving a placebo. This helps to ensure that any positive effects observed are not simply due to the participants' belief in the drug's healing powers. Random sampling and random assignment are techniques used to ensure that the sample studied is representative of the population of interest, and operational definitions are descriptions of how a variable is being measured in a study. While these techniques are important for research design, they do not specifically address the issue of bias in drug-evaluation studies.

Commonly Used in Drug-Evaluation Studies,________ Ensures That Research Participants' Belief