Experimenter can attribute human thoughts to animals {anthropomorphism}|.
Experiment needs control group {baseline}| with only moderate variation. Experiment can lack control group, or control group can have too much variation or use atypical people.
Experimenter can try to reach foregone conclusion {bias, experiment}|.
Subjects can desire to please experimenter {error, experiment}|. Subjects can ignore true stimulus or response. Subjects or experimenter can forget facts or reasons. Experimenter can make errors in reporting.
Experimental technique or method {valid method}| must try to avoid error and bias {validity, experiment}.
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Date Modified: 2022.0225