How to Design and Evaluate Research in Education, 5/e
Jack R. Fraenkel,
San Francisco State University Norman E. Wallen,
San Francisco State University
Internal Validity
Chapter Outline
What is Internal Validity?
Threats to Internal Validity
Subject Characteristics
Loss of Subjects (Mortality)
Location
Instrumentation
Testing
History
Maturation
Attitude of Subjects
Regression
Implementation
Factors that Reduce the Likelihood of Finding a Relationship
How Can a Researcher Minimize These Threats to Internal Validity?