Key points are not available for this paper at this time.
Robert E. Fullilove, Philip Uri Treisman, Mathematics Achievement Among African American Undergraduates at the University of California, Berkeley: An Evaluation of the Mathematics Workshop Program, The Journal of Negro Education, Vol. 59, No. 3 (Summer, 1990), pp. 463-478
Fullilove et al. (Mon,) studied this question.