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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.
Lab Experiment. Lab experiment, or âtrue-experimentâ, is a type of experimental design where the researcher has a. great leverage and control over the study, mainly in the form of selecting the participants and. randomly assigning participants and/or events into two or more study groups. Such randomization.