______ bias threatens internal validity by making the source of the observed change more ambiguous.
A) Internal
B) Pretest
C) Statistical
D) Selection

Name: ______ bias threatens internal validity by making the source of the observed change more ambiguous. A) Internal B) Pretest C) Statistical D) Selection
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Question

Quizplus · Accepted Answer

Selection bias threatens internal validity by making it unclear whether observed changes are due to the treatment or pre-existing differences between groups.

______ Bias Threatens Internal Validity by Making the Source of the Observed