Epidemiologists are researching the relationship betweeng two levels of tobacco exposure and a positive diagnosis of esophageal cancer. With SPSS, use the data set bd1.sav and the variables tob2 (dichotomized smoking status) and case

(yes or no esophageal cancer) to test the followin: Is there a difference in the incidence of esophageal cancer by tobacco exposure? (Hint: Are the exposure and the outcome variables independent of each other?) Include in your response the 5-step approach to hypothesis testing and an explanation of your decision to reject or fail to reject the null hypothesis.</o:p>