African Americans'lower average performance on IQ tests cannot be because of differences in vocabulary, because African Americans have slightly better performance on verbal tests than on nonverbal tests.
2.
;Circles and squares task : It was originally designed as a nonverbal test of ideational fluency and flexibility, then modified in such a way as to stress originality and elaboration.
3.
The Alpha test was a verbal test for literate recruits and was divided into eight test categories, which included : following oral directions, arithmetical problems, practical judgments, synonyms and antonyms, disarranged sentences, number series completion, analogies and information, whereas the Beta test was a nonverbal test used for testing illiterate or non-English speaking recruits.
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