Spearman proposed the concept of g after he found that
A) test items differed in the extent to which they predicted cognitive performance outside of the testing situation.
B) crystallized and fluid intelligence are easy to distinguish in factor analysis.
C) all test items he examined correlated with one another.
D) separate, unrelated factors, called primary mental abilities, exist.

Question

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Spearman proposed the concept of g after he found that all test items he examined correlated with one another. This led him to postulate that there must be a general factor of intelligence (g) underlying performance on all cognitive tasks.

Spearman Proposed the Concept of G After He Found That