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An Investigation of Test Bias in Two Nonverbal Cognitive Measures for Two Ethnic Groups

One hundred fifteen second- and third-grade Anglo and Mexican-American boys and girls from an isolated rural town in Arizona were tested on two nonverbal measures of cognitive skills to examine test bias when GPA and achievement test scores were being predicted. The issue of bias was addressed by regression analysis, which allowed examination of slopes and intercepts. The children from both ethnic groups were roughly equated on SES variables due to the nature and location of the community. Results suggested that the Raven's Coloured Progressive Matrices exhibited both slope and/or intercept bias on three of the four criterion variables, whereas the Nonverbal Test of Cognitive Skills (NTCS) demonstrated slope bias only in terms of GPA. The findings suggest that the Raven, contrary to previous research, may be a biased predictor for Mexican-Americans. NTCS bias may be due to factors unrelated to achievement.