1.8. Heart transplants. The Stanford University Heart Transplant Study was conducted to determine whether an experimental heart transplant program increased lifespan. Each patient entering the program was designated an official heart transplant candidate, meaning that they were gravely ill and would most likely benefit from a new heart. Some patients got a transplant and some did not. The variable transplant indicates which group the patients were in; patients in the treatment group got a transplant and those in the control group did not. Of the 34 patients in the control group, 30 died. Of the 69 people in the treatment group, 45 died. Another variable called survived was used to indicate whether or not the patient was alive at the end of the study." (Turnbull et al., 1974) 1.00 1500 0.75 Outcome 1000 0.50 alive Survival time (days) deceased 0.25 500 .... 0.00 0 control treatment control treatment a. Does the stacked bar plot indicate that survival is independent of whether or not the patient got a transplant? Explain your reasoning. b. What do the box plots above suggest about the efficacy (effectiveness) of the heart transplant treatment. c. What proportion of patients in the treatment group and what proportion of patients in the control group died