AP Psychology Practice Test 2026 - Free AP Psychology Practice Questions and Study Guide

Question: 1 / 530

What is a double-blind procedure?

A method where only the participants are unaware of who receives the treatment

A method where only the research staff knows who receives the treatment

An experimental procedure where neither the staff nor participants know who receives the treatment or placebo

A double-blind procedure is a crucial aspect of experimental research design aimed at minimizing bias. In this approach, neither the participants nor the researchers interacting with them know which individuals are receiving the treatment and which are receiving the placebo. This method ensures that the expectations of both the participants and the staff do not influence the outcomes of the experiment. By eliminating these biases, the validity of the study's findings is enhanced, leading to more reliable conclusions about the treatment's effectiveness.

This practice is particularly important in psychological and medical studies, where expectations can significantly sway results. When both parties are unaware, it helps maintain objectivity and uphold the integrity of the research.

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A type of surgery conducted without informing the patient

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