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(psychol) the influence of an experimenter's expectations on his results. experimenter effect in Medicine. experimenter effect n. The influence of the experimenter's behavior, personality traits, or expectancies on the results of his or her own research.
dependent variable; responds to changes in other variables in the experiment; the factor being measured in an experiment (what is observed AFTER the experiment) manipulated/independent variable independent variable; the one factor that is changed by the person doing the experiment (what we know before the experiment)