STATISTICS

Use the data in the table below to answer the following questions a. According to the data above, do you suspect any degree of association between the variables? Motivate your answer. (2) b. At the 5% signicance level, is there dependence or independence between aspirin use and myocardial infarction. Follow the necessary procedurea'steps using the Likelihood ratio test. (14 l c. Correct the estimation made by the statistic above using the Yates correction for continuity. (4) d. How much is the degree of over estimation? ( l ) e. Using the three measures of association, how much is the degree of dependence between the variables. ('7) f. Which of the measures given in 5 above gives more power. Explain (2) 3. In 20 hospitals from London, England, patients admitted with lung cancer in the preceding year were queried about their smoking behavior. For each of the 7'09 patients admitted, researchers studied the smoking behavior of a non-cancer patient at the same hospital of the same gender and within the same 5-year grouping on age. The 7'09 cases in the rst column of Table 1 are those having lung cancer and the 1'09 controls in the second column are those not having it. Table 1 Lung Cancer a. Identify the cell(s) responsible for the association between smoking and lung cancer by calculating the adjusted residuals. Interpret your results ( 10)