This study stems from attempts to develop prediction equations for freshman grade point average for two demographic classifications of students at a southwestern university. Although the particular results are probably of interest only to that university, certain aspects of the study should be of general interest, because, of the 3,237 students comprising the sample, 1,241 were classifiable as Spanish-surname individuals. Comparisons of the regression equations resulting from using SAT scores and high school quartile rank to predict freshmen grade point average indicate that different equations are necessary for different classifications of students. Since these data were obtained from an educational environment created by a semi-open admissions policy and thus represent no restriction in the range of SAT scores, the results of this study may be of special interest to individuals and educational institutions who deal with similar populations. (Author)