An uncontrolled threat to internal validity could

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An uncontrolled threat to internal validity can affect the results of a program evaluation in different ways, making the program appear either effective or ineffective. This is because an uncontrolled threat to internal validity can introduce bias into the study, confounding the relationship between the program and the outcome. Consequently, the observed effects of the program may be due to factors other than the program, or they may underestimate or overestimate the true effects of the program. Therefore, it is important to control for threats to internal validity in program evaluations to ensure that the results are valid and reliable. Additionally, an uncontrolled threat to internal validity can also increase the likelihood of a Type I error, which occurs when the null hypothesis (i.e., there is no effect of the program) is rejected when it is actually true.

An Uncontrolled Threat to Internal Validity Could