Threats to internal validity are those that jeopardize the study conclusions about whether an intervention in fact caused a difference in the study population.

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Threats to internal validity can affect the accuracy and validity of the study results and conclusions regarding the cause-effect relationship between the intervention and the outcome. These threats can include factors such as selection bias, maturation, history, regression to the mean, testing, instrumentation, and experimenter bias, among others. By addressing and minimizing these threats, researchers can increase the internal validity of the study and enhance confidence in the causal inferences drawn from the findings.

Threats to Internal Validity Are Those That Jeopardize the Study