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 μ2−μ1 between in the mean recovery times for the two​ medications, assuming normal populations with equal variances.
Medication 1
n1=10
x1=16
s21=1.7
Medication 2
n2=17
x2=19
s22=1.5