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<p>Have not seen that, but there is plenty of tabular data showing strong positive relationships between parental education and GPA and between parental income and GPA. The correlation of income with gpa is lower than the correlation of income with SAT. Authors speculate that this is because lower income students and higher income students attend different high schools with different grading standards. There is also similar data about the correlation between income and SAT 2 scores. The correlation is only slightly less than that between income and SAT 1. </p>
<p>Family income is also correlated with college gpa. However, SAT scores are better predictors of college GPA than are parent education or income.</p>