Changes in the participants due to their psychological or physical development that cannot be separated from the experimental manipulation is known as

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Maturation refers to changes in the participants that occur naturally over time, such as physical or psychological development, which may influence the outcome of the study and cannot be separated from the experimental manipulation. Testing refers to the effect of taking a test or being assessed multiple times, statistical regression refers to the tendency for extreme scores to move closer to the mean on subsequent tests, and attrition refers to participants dropping out of the study, all of which are different from maturation.

Changes in the Participants Due to Their Psychological or Physical