Which threat to internal validity is controlled in the one-group pretest-posttest design (O₁ X O₂)? A) attrition B) testing C) history D) maturation

Name: Which threat to internal validity is controlled in the one-group pretest-posttest design (O 1 X O 2 )? A) attrition B) testing C) history D) maturation
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The Answer of Which threat to internal validity is controlled in the one-group pretest-posttest design (O₁ X O₂)? A) attrition B) testing C) history D) maturation

Which Threat to Internal Validity Is Controlled in the One-Group