Chapter 9 Key Terms and Issues
KEY TERMS
External validity
Internal validity
Extraneous factors
History
Instrumentation
Matching
Maturation
Mortality
Pretest-posttest design
Regression
Selection
Selection by maturation interaction
Testing
Matching
Pretest-Posttest design
Key Issues
This chapter addresses four key questions:
1. What are Campbell and Stanley's threats to internal validity?
2. How do these threats operate in pretest/posttest designs?
3. How these threats operate in two-group designs?
4. What tradeoffs are commonly made between internal and external
validity?
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