A study was conducted to determine whether geographic variations in the use of medical and surgical devices could by explained in part by differences in the appropriateness with which physicians use these services. One concern might be that a high rate of inappropriate use of a service is associated with high overall use within a particular region. For the procedure coronary angiography, three geographic areas were studied: a high use site (Site 1), a low-use urban site (Site 2) and a low-use rural site (Site 3). Within each geographical region each use of this procedure was classified as appropriate, equivocal or inappropriate by a panel of expert physicians. These data are saved in a data set called angio. Site number is saved under the variable name site and level of appropriateness under appropro.

a. At the 0.05 level of significance, test the null hypothesis that there is no association between geographic region and the appropriateness of coronary angiography.

b. What do you conclude?