Galton's major contribution to intelligence testing was the development of the _____.

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Galton's major contribution was in the development of the mathematics underlying the correlation statistic, which is fundamental to the statistical analysis of intelligence test scores and many other types of psychological testing. He was a pioneer in applying statistical methods to the study of human differences and inheritance of intelligence, but he did not develop the intelligence quotient (IQ), deviation IQ score, or the concept of the g factor of intelligence.

Galton's Major Contribution to Intelligence Testing Was the Development of the _____