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. Find a 90% confidence interval for the difference 2 - , between in the mean recovery times for the two medications, assuming normal populations with equal variances Medication 1 n1 = 18 *1 = 13 $7 = 1.2 Medication 2 n2 = 12 X2 = 16 $5 = 1.1 Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. The confidence interval is