Spearman theorized that the positive relationship between the scores on intelligence subtests meant that the tests were measuring something in common-a "g" factor

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Spearman's theory of a general intelligence factor (g factor) proposes that there is a common underlying factor that influences performance on different cognitive tasks, which is supported by the positive correlations found between scores on intelligence subtests.

Spearman Theorized That the Positive Relationship Between the Scores on Intelligence