A study was conducted to determine the impact of a major Mexican peso devaluation on U.S. border retailers. As a part of the study, data were gathered on the magnitude of business that U.S. border retailers were doing with Mexican citizens. Forty-one shoppers of border city department stores were interviewed; 24 were Mexican citizens, and the rest were U.S. citizens. Thirty-five discount store shoppers were interviewed, as were 30 hardware store and 60 shoe store customers. In these three groups, 20, 11, and 32 were Mexican citizens, and the remaining shoppers were U.S. citizens. Use a chi-square contingency analysis to determine whether the shoppers' citizenship (Mexican versus American) is independent of type of border city retailer (department, discount, hardware, shoe) for these data. Let a = .05.