A sample of 19 male and 19 female 5th graders from a private school were tested on the 1949 WISC and the 1974 revised edition (WISC-R). Tests were administered in a partially counterbalanced order. Correlation coefficients for Verbal, Performance and Full Scale IQs were all very high as expected. On average, students scored 9.6 points higher on the WISC Verbal Scale and 8.4 points higher on the Performance Scale. Results for this small sample suggest the need for more frequent restandardization.
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