If in the course of an experiment you repeat measurements of the same individual, you introduce a confound called:

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If you repeat measurements of the same individual, you introduce a confound called testing, as taking the same measurement multiple times may influence the person's response or behavior. Maturation refers to changes within the individual over time, history refers to events outside of the study that may impact the results, and selection refers to bias introduced through the process of selecting participants.

If in the Course of an Experiment You Repeat Measurements