PPT Slide

Campbell and Stanley Threats to Internal Validity

Evaluation of Nonequivalent Control Group Design

HISTORY No

MATURATION No

TESTING No

INSTRUMENTATION No

REGRESSION No

SELECTION Yes

MORTALITY No

SELECTION X HISTORY Yes

SELECTION X MATURATION Yes

SELECTION X INSTRUMENTATION Yes

CONTAMINATION Yes

HAWTHORNE EFFECT Yes

EXPERIMENTER EXPECTATION No

Note: “Yes” means threat is unavoidable

Previous slide

Next slide

Back to first slide

View graphic version