Question: In order to estimate the difference between the average Miles per Gallon of two different models of automobiles, samples are taken and the following information is collected.

Model A Model B

Sample Size 60 55

Sample Mean 28 25

Sample Variance 16 9

a. At 95% confidence develop an interval estimate for the difference between the average Miles per Gallon for the two models.

b. Is there conclusive evidence to indicate that one model gets a higher MPG than the other? Why or why not? Explain.