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Examiners often are interested in knowing if the difference between two test scores is significant.
Applying one of several discrepancy analysis procedures usually does this. Some procedures for comparing scores within tests are described here. Confidence Bands Test scores are never perfectly accurate. Lucky or unlucky guesses, lapses of attention, and other factors mean that the same person would almost never get exactly the same score on a test twice in a row. A confidence band around a score tells how scores on that test are likely to vary by pure chance.