When subjects develop or change during the experiment as part of an ongoing process independent of the experimental treatment is known as

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Endogenous change refers to changes in participants that occur independent of the experimental treatment. These changes can affect the outcome of the study and must be taken into account by the researcher. Exogenous change refers to changes that are external to the study, contamination effects refer to unintended influences on the study, and selection bias refers to systematic differences in the characteristics of participants in different groups.

When Subjects Develop or Change During the Experiment as Part