Table 8.18 is an expanded version of a data set analyzed in Section 9.4.2. T h e response categories are (1) not injured, (2) injured but not transported by emergency medical services, (3) injured and transported by emergency medical services but not hospitalized, (4) injured and hospitalized but did not die, and (5) injured and died. Table 8.19 shows output for a model of f o r m (8.5). a. W h y are there four intercepts? Explain how they determine the estimated response distribution for males in urban areas wearing seat belts