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An Instructor’s Guide to Understanding Test …

An Instructor s Guide to Understanding Test reliability Craig S. Wells James A. Wollack Testing & Evaluation Services University of Wisconsin 1025 W. Johnson St., #373 Madison, WI 53706 November, 2003 2An Instructor s Guide to Understanding Test reliability Test reliability refers to the consistency of scores students would receive on alternate forms of the same test. Due to differences in the exact content being assessed on the alternate forms, environmental variables such as fatigue or lighting, or student error in responding, no two tests will consistently produce identical results.

3 Therefore, it is desirable to use tests with good measures of reliability, so as to ensure that the test scores reflect more than just random error.

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