If there is a difference between the pretest scores of the intervention and comparison groups in the NEGD,it indicates that there is selection bias.

Name: If there is a difference between the pretest scores of the intervention and comparison groups in the NEGD,it indicates that there is selection bias.
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A difference in pretest scores between the intervention and comparison groups suggests that the groups were not initially equivalent, indicating the possibility of selection bias.

If There Is a Difference Between the Pretest Scores of the Intervention