Experimenters may believe that a certain kind of treatment is effective. Consequently, experimenter expectations can bias research outcomes. One way to control for experimenter and participant bias is to

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The double-blind technique is the best option as it involves neither the participant nor the researcher knowing who is receiving the treatment or placebo. This controls for experimenter and participant bias as it removes the possibility of expectations influencing the outcomes. Reminding them of the importance of the research, debriefing them, and ensuring they understand ethics are important steps in conducting ethical research, but they do not directly control for bias.

Experimenters May Believe That a Certain Kind of Treatment Is