2008 SAT Scores By Race By Income
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2008 SAT Scores By Race By Income

From the Journal of Blacks in Higher Education:
Racial Scoring Gap 
For both blacks and whites, family income is one of the best predictors of a student’s SAT score. Students from families with high incomes tend to score higher. Students from low-income families on average have low SAT scores. Because the median black family income in the United States is about 60 percent of the median family income of whites, one would immediately seize upon this economic statistic to explain the average 200-point gap between blacks and whites on the standard SAT scoring curve. 

This is on the once and future 1600 point scale, not 2400 points. The test was renormed in 1995 with the intention of having a mean of 1000 and a standard deviation of 200, although the standard deviation has usually been higher than that.

But income differences explain only part of the racial gap in SAT scores. For black and white students from families with incomes of more than $200,000 in 2008, there still remains a huge 149-point gap in SAT scores. Even more startling is the fact that in 2008 black students from families with incomes of more than $200,000 scored lower on the SAT test than did students from white families with incomes between $20,000 and $40,000. 
But the fact is that even when family income levels are similar, we are still comparing black and white students who are as different as apples and oranges in terms of educational sophistication, family educational heritage, family wealth, and access to educational tools and resources. The average white family in the same income group is far better equipped than the average black family to prepare their children for success on the SAT test.
On the other hand, some data suggests that black and white students with the same family net worth score about the same on the SAT. The concept of "regression toward the mean" may help explain these two findings.
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