Two things:
Neither is black nor white, but rather one is cyan, and the other is a light red. I’m pretty sure the two combined do not make blue, which leads me wondering about your art IQ.
Second, this is coming from the “bell curve” studies of the 80s, which has already been thoroughly demonstrated to be flawed from its inception, by picking white students from affluent and well funded schools, and blacks from highly underfunded and overcrowded schools. Gee, wonder if that might have some effect.
As I’ve said before, I may put a little more stock into this study if it were to compare black and white students from the same schools, though I should add those schools should have as close to a 1:1 ratio between black and white students as possible, as well as being a school established as such for at least a full generation.