High mean ranks indicate high math Kruskal-Wallis Test achievement and competence scores. Ranks father's educ revised N Mean Rank ath achievement test HS grad or less 38 28.43 Some College 16 43.78 BS or More 19 48.42 Total 73 competence scale HS grad or less 37 36.04 Some College 16 35.78 BS or More 18 36.11 Total 71 Test Statisticsab math achievement competence test scale Kruskal-Wallis H 13.384 003 df 2 2 Asymp. Sig. 001 999 a. Kruskal-Wallis Test b. Grouping Variable: father's educ revised