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Equivalent forms of a ten-item completion test were constructed. The same test items then were rewritten in matching format and in multiple-choice format, resulting in two forms (A and B) of each of three types of test. All tests were administered to 73 examinees, and parallel-forms reliability coefficients (correlation between scores on A and B) were calculated. These empirically obtained values were compared to the values of the reliability coefficient predicted from theoretically derived equations which indicate the influence of chance success due to guessing on test reliability. In accordance with theory it was found that the completion test was more reliable than the matching test and that the matching test was more reliable than the multiple-choice test. The empirically obtained reliability coefficients were very close to those predicted from the mathematically derived formulas.
Zimmerman et al. (Thu,) studied this question.