Evaluation of the Attitudes Toward Statistics Scale (ATS) of S. L. Wise (1985) was extended by examining scale responses in relation to: (1) the scale's factor structure; and (2) the correlation of ATS subscale scores with students' grades in statistics courses at several levels of graduate study, students' sex, and scores on measures of basic mathematics and comprehension of statistical terminology. In the spring of 1990, data were obtained from 193 students in masters' and doctoral basic and advanced statistics courses, including one on experimental design. High degrees of factorial and predictive validity were found for the ATS. Factors that emerged were identical to those derived by Wise. Subscale scores correlated with students' grades overall at the different levels. ATS COURSE subscale scores were the single best predictor of student grades in the experimental design course. The ATS appears promising as an adjunct to mathematics-related variables in predicting performance in graduate-level statistics courses. Five tables present study data. A six-item list of references is included. (SLD)