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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Using the double-blind technique is the best way to control for experimenter and participant bias. This technique involves neither the experimenter nor the participant knowing which group (treatment or placebo) they are in, which helps eliminate bias in the research outcomes. Other options, such as reminding them of the importance of the research or debriefing, may help mitigate some bias but are not as effective as the double-blind technique.

Experimenters May Believe That a Certain Kind of Treatment Is