If the tool being used to evaluate performance changes in some way between pretest and posttest, then _______ can be a threat to the study's internal validity.

Name: If the tool being used to evaluate performance changes in some way between pretest and posttest, then _______ can be a threat to the study's internal validity.
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The Answer of If the tool being used to evaluate performance changes in some way between pretest and posttest, then _______ can be a threat to the study's internal validity.

If the Tool Being Used to Evaluate Performance Changes in Some