In this video I explain two well-known examples of observer bias: the case of Clever Hans, and Rosenthal and Fode's experiment with "bright" and "dull" rats. Observer bias (or experimenter expectancy effect) is considered, along with an explanation for how to reduce this bias.
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Enable closed-captioning or find a full transcript of this video here: http://www.psychexamreview.com/observer-bias-clever-horses-and-dull-rats/