A very strong correlation.
Speculation over socioeconomic status as an educational metric is nothing new, but today we have a nice chart on it. It is tough to argue that income of the parents doesn’t play a considerable factor in a student’s achievements and education.
Daniel Pink used numbers from College Board’s 2011 Total Group Profile Report and examined college-bound high school seniors to create this chart. He summed their scores on the three portions of the SAT: reading, writing, and math. The students were then distributed by income and their score averages.
We can clearly see that as family income rises across the X axis, SAT scores rise across the Y axis.