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An Instructor’s Guide to Understanding Test Reliability ...
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. This is true regardless of how similar the two tests are. In fact, even the same test administered to the same group of students a day later will result in two sets of scores that do not perfectly coincide.
Although reliability does increase with test length, the reward is more evident with short tests than with long ones. Increasing test length by 5 items may improve the reliability substantially if the original test was 5 items, but might have only a minimal impact if the original test was 50 items. The Spearman-Brown prophecy formula (shown
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