WISC IQs obtained by 300 black children and 300 white children were compared. The subjects were 15 white males, 15 white females, 15 black males, and 15 black females at each age level from 6 to 15 yr. Mean IQs on the Verbal, Performance, and Full Scale for blacks were 6968, 6992, and 6691 respectively and were significantly lower than the respective average of 7980, 7980, and 7950 for whites. Means, standard deviations, and ts for stratified samples by sex and race were also reported.
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