Specific Motors of Detroit has developed a new automobile known as the M car. 24 M cars and 28 J cars (from Japan) were road tested to compare miles-per-gallon (mpg) performance. sample 1 (M cars) : n1 = 24, X 1 = 29.8, s1 = 2.56 sample 2 (J cars) : n2 = 28, X 2 = 27.3, s2 = 1.81

Develop a 90% confidence interval estimate of the difference between the mpg performances of the two models of automobile 1 2.