Inequality of schooling
Some writers have pointed to supposed educational inequalities as a cause of poor Negro performance in IQ and achievement tests. Thus, Bodmer and Cavalli-Sforza (1970, p. 27) write: 'Black schools are well known to be generally less adequate than white schools, so that equal number of years of schooling certainly do not mean equal educational attainment.' This statement clearly implies that the Negro-white scholastic achievement gap (generally equivalent to two to four grade levels at high school graduation) is attributable, at least in large part, to the superior school facilities enjoyed by white children. But there is now massive evidence which clearly contradicts this claim.