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¶

Claim · All claims
Evidence · 1 study · associational r1 · q2 · i2 medium
Currency · newest study 1921 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i2 In the Normal School data, Thurstone scores correlated 0.41 and Brown scores 0.56 with semester grades; in the junior high school, Illinois scores correlated 0.25 and Otis scores 0.32 with school marks. → 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 · i2 · associational · r1

Correlational comparison of intelligence scores with scholarship in the Normal School groups. The article prints correlations r = 0.25 (Illinois) and r = 0.32 (Otis) with school marks, plus freshman correlations of 0.41 (Thurstone) and 0.56 (Brown) with semester grades.

"In the junior high school the correlations are: Illinois Intelligence scores with school marks, 0.25; Otis scores with marks, 0.32."

Discussion¶

Learner Variables¶

• General Cognitive Ability — predictor: learners who differ on it differ in outcomes

Related Claims¶

• Thurstone-Brown agreement was closer than Otis-Illinois: median rank changes of 6.7 places (freshmen, r = 0.74) and 10.4 places (sophomores, r = 0.613), with 26 and 32.8 per cent wrongly classed — related
• Rankings of the same 120 junior high pupils by the Otis and Illinois group intelligence tests disagreed by a median of 18 places, with a rank correlation of 0.642 — related
• Otis scores proved of practical value over a two-year trial for guiding junior high pupils' choice between a foreign language and manual work — related
• Clement's five group intelligence tests intercorrelated only modestly, with the Indiana Mental Survey below 0.40 against all others — related
• Correlations between two forms of the same test (up to 0.94, averaging 0.83 in Colvin's data) far exceed between-test correlations, casting doubt that different 'general intelligence tests' measure the same element — related
• IQ-grade correlation differs sharply by class standing: .69 for Juniors versus .17 for Sophomores, rising to .48 when three discrepant records are omitted — related
• Prior studies show low and variable correlations between mental tests and college grades, averaging from .09 to .44 — related
• Test results correlate more highly with estimated intelligence than with grades, including Starch's .75 versus .30 at Wisconsin — related
• Standardized group test scores correlate weakly and variably with freshman class averages, ranging from 0 to .25 — related
• Directional correlations between test scores and discrepancy direction are low but suggest tension tests track scholarship superiority and assimilation tests track intelligence superiority — related
• Total point score correlates with teachers' school marks at .80, .41, and .50 in the fourth, sixth, and eighth grades, and brightness coefficients rise with amount of schooling — related