CORRECTION FOR GUESSING IN TRUE-FALSE TESTS: AN EXPERIMENTAL APPROACH

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Abstract

Summary. Current views on the problem of correction for undeserved scores likely to be obtained by testees on true-false achievement tests, given with either ‘guess’ or ‘do not guess’ instructions, are summarised. The desirability of a new approach is discussed, and an investigation which led to the conclusion that ‘S=R —·5W,’ may be an appropriate formula for ‘do not guess’ tests is reported. The experimental results are shown to conform to a simple mathematical theory, and from the latter a conjecture is made about the formula appropriate to ‘guess’ tests.

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