owing 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. Find a 90% confidence interv erence H2 - u between in the mean recovery times for the two medications, assuming normal populations with equal variances. dication 1 n1 = 18 Xy = 15 S= = 1.3 dication 2 n2 = 14 X2 = 19 5 = 1.2 ere to view page 1 of the table of critical values of the t-distribution. ere to view page 2 of the table of critical values of the t-distribution. nfidence interval is