As one example of survival data, we looked at the remission duration times on 42 patients with acute leukemia, half of which received 6-MP and the other half a placebo. The dataset LEUKEMIA.DAT on Canvas has with the following format: Variable Columns Group (1 = 6-MP, 2 = Placebo) 1 Remission time (in weeks) 3-4 Censoring status (1=censored, 2=not censored) 6 a. Estimate the Kaplan-Meier remission duration curves using SAS. b. Test to determine if the groups are significantly different and interpret your results