Use the following data and= .10 to construct a 90% confidence interval to estimate _{1 2}. Assume x is normally distributed in the populations and the variances of the populations are approximately equal.

Sample 1

n1=20

X1=118

s1=23.9

Sample 2

n1=20

X2=113

s1=21.9

Round your answers to 3 decimal places

_{1 2}