Threats to experimental validity are extraneous or uncontrolled factors that can influence the outcomes of a study, potentially compromising the accuracy of the conclusions regarding cause and effect. These are also referred to as threats to internal validity.
[Reference: Helwig, A. A. (2020). CPCE Study Guide and Review; Royse, D., Thyer, B. A., & Padgett, D. K. (2016). Program Evaluation: An Introduction., ]
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