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Aptitude Treatment Interaction1
Class Activities1
Classroom Environment1
Classroom Techniques1
Control Groups1
Diffusion (Communication)1
Intervention1
Learning Processes1
Theory Practice Relationship1
Validity1
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Journal of Educational…1
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Craven, Rhonda G.1
Debus, Raymond L.1
Jayasinghe, Upali1
Marsh, Herbert W.1
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Diffusion Effects: Control Group Contamination Threats to the Validity of Teacher-Administered Interventions.
Peer reviewed Peer reviewed
Craven, Rhonda G.; Marsh, Herbert W.; Debus, Raymond L.; Jayasinghe, Upali – Journal of Educational Psychology, 2001
Within-class experimental designs are subject to diffusion effects whereby both experimental and control students benefit from the intervention, thereby contaminating the control group and biasing evaluations of intervention effects. In support of diffusion effects, this study showed that a classroom intervention resulted in higher academic…
Descriptors: Aptitude Treatment Interaction, Class Activities, Classroom Environment, Classroom Techniques