Which if the following is not a threat to internal validity?

Name: Which if the following is not a threat to internal validity?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Noise is not a threat to internal validity, as it refers to random fluctuations or variability in measurements that are not systematic or related to the independent variable. The other options, statistical regression, mortality, and diffusion of treatment, all have the potential to impact the internal validity of a study.

Which If the Following Is Not a Threat to Internal