This exercise teaches undergraduate geography students to use the Lorenz Curve and the Index of Dissimilarity to assess the spatial distributions of the White, Black, and American Indian populations of the United States in 1980. Specific procedures for implementing the exercise are provided; solutions to the exercise are also included. Students used the "Statistical Abstract of the United States, 1982-1983" as the source of their data. The exercise was initially designed to be used in an introductory quantitative methods class where the students had minimal statistical and computer skills. As students' quantitative and computer skills have improved, variations of the exercise have been used. For example, the students now analyze the spatial distributions of the three ethnic populations at the census division, state, and county levels. The Lorenz Curve for the 50 U.S. states and the 67 counties of Alabama and the indices of dissimilarity are illustrated. The data of the original exercise were also used to develop exercises for the Friedman's Rank Sums and Kruskal-Wallis One Way Analysis of Variance and to illustrate the spatial inequality of U.S. ethnic populations in introductory human geography courses. (RM)