15. Researchers conducted a study to determine which of two different treatments, A or B, is more effective in the treatment of atherosclerosis. The results of their experiment are given in the table. Treatment A Treatment B Selfod s6 ballaeslo ed sodiq sisb s nso .d Effective 420 435 Not effective 130 140 (a) Which treatment appears to be more effective? Why? 6078 net mollen: The data in the table do not take into account the seriousness of the case. The data shown in the next table show the effectiveness of each treatment for both mild and advanced cases of atherosclerosis. 000 850 |000.3X-02 2 1 000.08-282 1 000,28-098 1000.08 8 > Mild SOS Advanced amol nwo atherosclerosis atherosclerosis Treatment A Treatment B|Treatment A Treatment B Effective 310 95 110 340 Not effective 80 20 50 120 (b) Determine the proportion of mild cases of atherosclerosis that were effectively dealt with using treatment A. Determine the proportion of mild cases of atherosclerosis that were effectively dealt with using treatment B. (c) Repeat part (b) for advanced cases of atherosclerosis to create a conditional distribution of effectiveness by treatment for each category of the disease. 10