. 2d 396 (1977). Second, it charges that Nucor's facially neutral promotions policies and procedures had a racially disparate impact. See Griggs v. Duke Power Co., 401 U.S. 424, 431, 91 S. Ct. 849, 28 L. Ed. 2d 158 (1971); Wal-Mart, 131 S. Ct. at 2554. Both theories are grounded in a statistical analysis of r