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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.
The independent variable is the variable that the researcher manipulates in the experiment. This variable will then be hypothesized in order to influence the dependent variable. The independent variable has a big effect on the entire experiment, and is very important in drawing the conclusion of the experiment.