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Observer Expectancy Effect. The observer expectancy effect, also called the experimenter expectancy effect, is a phenomenon that can occur when a researcherâs beliefs or expectations cause him or her to unconsciously influence the participants of an experiment. In order to conserve the internal validity of an experiment, researchers can use a double-blind experimental design.
Floor Effect In research a floor effect (aka, Basement Effect) is when measurements of the dependent variable (the variable exposed to the independent variable and then measured) result in very low scores on the measurement scale.