BELOW CHANCE PERFORMANCE ON A VERBAL TEST USING PAIRED CONCEPTS 315 pointed out. A person who operates on a random basis will get a better score (mean 37.5) than persons who have some knowledge and operate on the kinds of bases indicated, namely to assume generally that when only one concept is known or both are not known, they are Different. On the other hand, dichotomizing persons getting scores of 37 and 38 (manifest chance level) by the ratio of Same to Different correct responses did not indicate any corresponding difference on WAIS scores.
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