See my post #112 for the link to the actual data.
Critics claim that SAT and IQ scores are highly correlated with parental income, and thus reflect socioeconomic bias. My response is that the critics have it backwards, and that the parents' income is to a large extent attributable to their IQ, and that "correcting" for parental income actually corrects for the genetic component of IQ.
There are those that say that the creators of great fortunes did not necessarily have extreme IQs, and they are correct that, for ultra high incomes, other factors come into play. But within the income range of $20K to $200K, IQ plus the willingness to study and learn (factors that are reflected in the SAT) are highly correlated with economic success.
Thank you for the link, off to read more.
I’ve also read summaries of studies which showed that blacks actually scored higher on the parts of IQ tests which could be said to have more “cultural bias” than on the parts which measured pure cognitive ability. So that “cultural bias” actually helps their scores.