Two major automobile manufacturers have produced compact cars with engines of the same size. We are interested in determining whether or not there is a significant difference in the mean MPG (miles per gallon) when testing for the fuel efficiency of these two brands of automobiles. A random sample of eight cars from each manufacturer is selected, and eight drivers are selected to drive each automobile for a specified distance. The following data (in miles per gallon) show the results of the test. Assume the population of differences is normally distributed. Driver Manufacturer A Manufacturer B 34 27 29 21 28 26 4 28 23 27 23 6 31 24 7 33 27 8 27 26 Find the mean of the differences. 0 4 O 4.5 kers 0 5 O 5.5 Need Help? Read It Submit