6. You are given that the estimate of a survival function at time 80 is $(80) = 0.3, and that var {$(80)} = 0.03. (c) Calculate the 99% linear confidence interval for S(80). (d) Calculate the 99% log-confidence interval for S(80). 6. You are given that the estimate of a survival function at time 80 is $(80) = 0.3, and that var {$(80)} = 0.03. (c) Calculate the 99% linear confidence interval for S(80). (d) Calculate the 99% log-confidence interval for S(80)