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(1822-1911) Influenced by his cousin, Charles Darwin, was keenly interested in the measurement of individual differences. _______ was convinced that intellectual ability is inherited and, therefore, recommended _______, or the selective breeding of humans. He was the first to attempt to systematically measure ________, to use a ________ to gather data, to use a word-association test, to study mental ______, to define and use the concepts of correlation and ______-, and to systematically study twins.

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