Reliability and validity of the D-48 with Mexican American college students

The D-48, a nonverbal test of general intelligence, is widely used in Europ e and other areas of the world, but virtually unknown in the United States. In this study, the D-48 and the School and College Ability Tests (SCAT) we re administered to a sample of 250 community college students who were cont inuing their studies at a large state university. Of the 250 students, 145 were Mexican American and 105,were Anglo. The results indicate no significa nt mean differences due to ethnicity, gender; or the interaction of the two . Both internal consistency and test-retest reliability were adequate. A st ep-wise regression analysis indicated an R-2 of .36 with grade point averag e (GPA), with the D-48 entering as a second variable behind the SCAT Total. Finally, scores on the D-48 correlated modestly but significantly with GPA and with SCAT scores, indicating that the D-48 may be a useful adjunct to assess the capabilities of Mexican American students.