Q3 A clinical trial is being carried out to test the effectiveness of a new drug. Sixty patients were involved in the trial, which followed them for 2 years from the start of their treatment. The following data show the period in complete months from the start of treatment to the end of observation for those patients who died or withdrew from the trial before the end of the 2-year period. Deaths: 8, 10, 10, 16, 20 Withdrawals: 2, 6, 9, 16, 18, 22, 22 (i) Calculate the Kaplan-Meier estimate of the survival function. Construct an approximate 95% confidence interval for the probability that a patient survives for at least 18 months after the start of the drug treatment. (ii)

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