correlation between iq and grades

Introduction

The relationship between intelligence quotient (IQ) and academic performance has been a subject of extensive research. Understanding this correlation is crucial for educational policy, psychological assessment, and societal expectations regarding scholastic success.

Key Insights

Strong Correlation Between IQ and Academic Achievement:
- Multiple studies have found a significant positive correlation between IQ and school grades, with correlations ranging from 0.54 to 0.81 . This indicates that higher IQ scores are generally associated with better academic performance.
IQ as the Best Predictor of GPA:
- Intelligence, as measured by standardized tests like the Raven’s Standard Progressive Matrices, is consistently the strongest predictor of students' grade point average (GPA) across various grade levels .
Subject-Specific Variations:
- The strength of the correlation between IQ and academic achievement varies by subject. For example, the correlation is higher in subjects like Mathematics and English compared to Art and Design.
Longitudinal Stability:
- The relationship between early school achievement and later IQ remains stable over time, suggesting that early academic performance can be a good indicator of future cognitive abilities.
National IQ and Educational Achievement:
- At a national level, there is a high correlation between average national IQs and educational achievement in subjects like mathematics and science, indicating that countries with higher average IQs tend to perform better academically.
IQ and Vocational vs. Academic Courses:
- The correlation between IQ and grades is stronger for academic courses compared to vocational courses. A minimum IQ threshold is often required for success in more academically rigorous programs.

Conclusion

The research consistently shows a strong positive correlation between IQ and academic performance. Intelligence, as measured by standardized tests, is a robust predictor of GPA and overall scholastic achievement. This relationship holds true across different subjects, grade levels, and even at a national level. While the strength of the correlation can vary by subject, the general trend indicates that higher IQ scores are associated with better academic outcomes.

Correlation between iq and grades

Summary

Introduction

Key Insights

Conclusion

Sources and full results

Intelligence and school grades: A meta-analysis

Intelligence tests have a population correlation of.54, with variations in the relationship depending on school subject domains, grade levels, and test type, but gender has no effect on the relationship.

Personality and intelligence as predictors of academic achievement : A cross-sectional study from elementary to secondary school

Intelligence is the strongest predictor of students' grade point average from elementary to secondary school, followed by Agreeableness in Grades 2 to 4 and Conscientiousness in Grades 6 to 12.

Intelligence and educational achievement

General intelligence at age 11 is positively associated with educational achievement in 25 academic subjects at age 16, with girls showing no advantage in g but performing better in all subjects except Physics.

NATIONAL IQS PREDICT DIFFERENCES IN SCHOLASTIC ACHIEVEMENT IN 67 COUNTRIES

National IQs and educational achievement are highly correlated, with national differences in IQ amplifying educational achievement differences in 67 countries.

Otis-Lennon Mental Ability Test, Stanford Achievement Test, and Three Demographic Variables as Predictors of Achievement in Grades 2 and 4

The best predictor of achievement in Grades 2 and 4 is the IQ variable, while the SAT is the best predictor for Grade 2, with IQ being a negligible factor.

Correlations between WISC-R IQS and Wide Range Achievement Test Grade Equivalents for Intellectually Gifted Students

The WISC-R IQ scores and Wide Range Achievement Test grade equivalents show significant correlations in intellectually gifted students, with little common variance.

School achievement strongly predicts midlife IQ

Standardized school achievement data is a useful measure of premorbid IQ, with elementary school achievement strongly predicting midlife IQ and being correlated with occupational status and household income.

Group IQ Scores as Predictors of Success in Secondary Schools: A Re-evaluation

Group IQ scores are not a reliable predictor of academic grades and high-school completion, as they are less predictive of vocational course grades than academic course grades.

What grades and achievement tests measure

Grades and achievement tests are better predictors of life outcomes than IQ, as they capture personality traits with independent predictive power beyond IQ.

Association between Intelligence Quotient Dental Anxiety and Oral Health-related Quality of Life in Children: A Cross-sectional Study

Children with higher IQ have lower oral health-related quality of life, while dental anxiety is negatively correlated with IQ and OHRQoL.

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