Sure enough, Flynn says he found a mistake in the way that some of the military data had been analyzed. But as he investigated further, he realized that Jensen and others would dismiss his findings on the grounds that military intelligence tests were--in contrast to other IQ tests--heavily educationally loaded. In other words, education played a big role in performance. Because black recruits were better educated in the 1950s than they were in the 1920s, any rise in their scores could be attributed to education, not to "real" IQ gains.
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