The threat of testing as a source of internal validity in experiments occurs when there is:

Question

Quizplus · Accepted Answer

The threat of testing as a source of internal validity occurs when there is a pretest but not a comparison group. This is because the act of taking a pretest can influence participants' responses in subsequent posttests, independent of any experimental manipulation, making it difficult to attribute changes to the experimental variable alone.

The Threat of Testing as a Source of Internal Validity