Consider a case-control study of the possible associationbetween alcohol consumption and the risk of esophageal cancer asreported by Tyns et al. (1977). The study entailed 200 malesdiagnosed with esophageal cancer in one of the regional hospitalsbetween the years1972 and 1974, and controls were a sample of 775adult males selected from electoral lists in each community. Thedata on alcohol consumption dichotomized at a value of 80 g/d forcases and controls are summarized below:
Average alcohol consumption(g)                  Cases   Controls          Total
>80Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 96Â Â Â Â Â Â Â Â 109Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 205
<80Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 104Â Â Â Â Â Â 666Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 770
Total                                                    200      775                  975
Carry out a test of possible association between the averagedaily alcohol consumption and the risk of esophageal cancer.Calculate 95% CIs of the measure of association and interpret yourfindings.
