The following data represent the length of time, in days,
Chapter , Problem 5.29(choose chapter or problem)
The following data represent the length of time, in days, to recovery for patients randomly treated with one of two medications to clear up severe bladder infections: Medication 1 Medication 2 n1 = 14 n2 = 16 x1 = 17 x2 = 19 s2 1 = 1.5 s2 2 = 1.8 Find a 99% confidence interval for the difference 21 in the mean recovery times for the two medications, assuming normal populations with equal variances.
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