Abstract
The present study tested matched samples of 15 retarded and 15 normal children on the Stanford-Binet Intelligence Scale and the McCarthy Scales of Children's Abilities. Pearson correlations between Stanford-Binet IQs and the six McCarthy Scale Indexes for retarded subjects were lower than coefficients obtained from the normal subjects and from previous research. While the General Cognitive Index may be interchangeable with IQ in the Normal range of intellectual functioning, this relationship was not found for the retarded subjects in the present study. The "venerable" Stanford-Binet retains its position as the most broadly applicable measure of intellectual functioning. Implications of the study as well as an outline for future research were included.
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