The Kaplan–Meier estimates of the survival functions for three treatments used in treating ovarian cancer are given in Figure 13.7, and the results of the log-rank test are given in Table 13.14. Use the information given in Figure 13.7 and Table 13.14 to answer the following:

(a) Is there sufficient evidence to reject the equality of the survival functions for the three treatments? Explain.

(b) Which treatment appears to have the highest survival probability for ???? = 36 months and for ???? = 48 months?

(c) Which treatment appears to have the smallest median survival time?