Clement's five group intelligence tests intercorrelated only modestly, with the Indiana Mental Survey below 0.40 against all others¶

Claim · All claims
Evidence · 1 study · associational r1 · q2
Currency · newest study 1921 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? In Clement's study of five group intelligence tests given to 49 Northwestern University students, Pearson correlations ranged from 0.22 to 0.60; the Indiana Mental Survey correlated with none of the others by as much as 0.40. → Geyer 1921

Evidence¶

Geyer 1921¶

Geyer, D. L. (1921). The Reliability of Rankings by Group Intelligence Tests. The Journal of Educational Psychology. https://www.jstor.org/journal/jeduapsy

q2 · i? · associational · r1

The article reports, citing J. A. Clement's study of 49 Northwestern University students, ten pairwise Pearson correlations (e.g., Army-Thurstone 0.60, Pressey-Indiana 0.22). The review attributes the finding to Clement's published study.

"It is here seen that the Indiana Mental Survey test correlates with none of the others by as much as 0.40, and that the Pressey Cross Out test has no correlations as high as 0.45."

Discussion¶

Related Claims¶

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• Group intelligence scores correlated only modestly with school marks (freshmen: 0.41 Thurstone, 0.56 Brown; junior high: 0.25 Illinois, 0.32 Otis), which the author attributes to marks depending on many non-intelligence factors — related