The threat to internal validity called attrition refers to having participants leave the study between pretest and posttest.

Name: The threat to internal validity called attrition refers to having participants leave the study between pretest and posttest.
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Attrition refers to the loss of participants during the course of a study, which can threaten the internal validity by potentially skewing the results if the characteristics of those who leave differ significantly from those who remain.

The Threat to Internal Validity Called Attrition Refers to Having