Mann-Whitney Test Ranks Sum of mother's educ revised N Mean Rank Ranks math courses taken HS grad or less 46 25.36 1166.50 BS or More 9 41.50 373.50 Total 55 Test Statistics math courses taken Mann-Whitney U 85.500 Wilcoxon W 1166.500 Z -2.830 Asymp. Sig. (2-tailed) 005 a. Grouping Variable: mother's educ revised