Edited sentence: Less than half (41%) of Americans surveyed are aware that, on average, blacks score lower than whites on IQ tests—and most of those who are aware of that gap substantially underestimate its size.Politically conservative Americans are more likely to be cognizant of the black-white IQ gap and its magnitude, which may help explain why they are more likely to attribute racial inequalities in employment or income to differences in average intelligence—while politically liberal and black Americans, who are less well-informed about the IQ gap, are more likely to ascribe such inequalities to racial discrimination or other causes.Research reveals that policy preferences may be affected by significant public misperceptions concerning racial gaps in intelligence testing