Charles Spearman proposed the theorem of the indifference of the indicator

Question

Charles Spearman proposed the theorem of the indifference of the indicator - that a persons score any test of mental ability can predict their score on another test of mental ability

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Charles Spearman did propose the theorem of the indifference of the indicator, which states that a person's score on any test of mental ability is an indicator of their score on any other test of mental ability. This is also known as the concept of general intelligence or "g" factor.