3. The following data represent the length of time, in days, to recovery of patients randomly treated with one of two medications to clear up several bladder infections: Compute a 90% confidence interval estimate for the difference of means. Medication 1 n1=14 x=17 s²=1.5 Medication 2 n2=16 y=19 s=1.8 Compute a 90% confidence interval estimate for the difference of means.

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