The related concepts of reliability and measurement error are often difficult for students to understand. This article describes a simple and inexpensive demonstration of several underlying notions necessary to understanding these concepts: chance score, true score, error variance, true score variance, and their relation to each other and to reliability.
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References
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HopkinsK. D.StanleyJ. C.HopkinsB. R. (1990). Educational and psychological measurement and evaluation7th ed.). Englewood Cliffs, NJ: Prentice Hall.
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SaxG. (1980). Principles of educational and psychological measurement and evaluation.Belmont, CA: Wadsworth.
