A spouse can go to one of two local hospitals for heart surgery. Checking the history for the past year, you find that each of the two hospitals has performed cardiac surgery on 1000 patients. In hospital A 710 patients survived (71%). In hospital B 540 (54%) survived. Based on the numbers presented, which hospital do you think is superior in cardiac surgery? Surely hospital A is better, right? Now, let's look at more data. The below chart summarizes three categories of patients (those entering in fair, serious and critical condition) and the survival rate from surgery (in percent) for the two local hospitals. Patient Entering Condition Fair Serious Critical Total Hospital A Hospital B 700 200 100 1000 100 200 700 1000 Survivors from A (# and percent) 600 or 86% 100 or 50% 10 or 10% 710 or 71% Survivors from B (# and percent) 90 or 90% 150 or 75% 300 or 43% 540 or 54% Looking at the data broken down in this way, we see that Hospital B has a higher success rate in all three categories of patients but when averaged all together, Hospital A has the higher overall survival rate. Based on the numbers presented, which hospital do you think is superior in cardiac surgery