IQ-grade correlation differs sharply by class standing: .69 for Juniors versus .17 for Sophomores, rising to .48 when three discrepant records are omitted¶

Claim · All claims
Evidence · 1 study · associational r1 · q2
Currency · newest study 1919 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? The Junior group's IQ-grade correlation (.69) far exceeded the Sophomore group's (.17); omitting three discrepant Sophomore records raised the Sophomore coefficient to .48. → Caldwell 1919

Evidence¶

Caldwell 1919¶

Caldwell, Helen Hubbert. (1919). Adult Tests of the Stanford Revision Applied to College Students. The Journal of Educational Psychology, X(10). https://doi.org/10.1037/h0074484

q2 · i? · associational · r1

Within the same 48-student correlational study, Table II reports Juniors' IQ-grades correlation of .69 and Sophomores' .17; the text attributes the Sophomore discrepancy to three students and states the corrected value: "the correlation between intelligence quotient and grades for the Sophomores is .48."

"When these three records are omitted, the correlation between intelligence quotient and grades for the Sophomores is .48."

Discussion¶

Learner Variables¶

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

Related Claims¶

• Stanford Adult test results correlate .44 with college grades when Juniors and Sophomores are re-ranked as one group — related
• 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
• Three Sophomores' discrepant records trace to character factors, including over-rating due to verbal fluency — related
• Prior studies show low and variable correlations between mental tests and college grades, averaging from .09 to .44 — a broader claim this one bears on
• Directional correlations between test scores and discrepancy direction are low but suggest tension tests track scholarship superiority and assimilation tests track intelligence superiority — related
• The Rosanoff High Standard Frequency Test, but not writing-speed measures, diverges sharply between high-discrepancy and control students — related
• Correlations between Alpha and grades vary by class standing, lowest for graduates (r = .15) and highest for seniors (r = .38) — related