Construct a 95% confidence interval to estimate µ1 – µ2

Construct a 95% confidence interval to estimate µ1 – µ2 by using the following data. Assume the populations are normally distributed.,Sample 1 …… Sample 2,x?1 = 74.6 …….. x?2 = 70.9,s21 = 10.5 ……… s22 = 11.4,n1 = 18 ………… n2 = 19