Gas Mileage Hoping to Improve the Gas Mileage of Their

Gas mileage Hoping to improve the gas mileage of their cars, a car company has made an
adjustment in the manufacturing process. Random samples of automobiles coming off the
assembly line have been measured each week that the plant has been in operation. The
data from before and after the manufacturing adjustments were made are in the table. It is
believed that measurements of gas mileage are normally distributed. Write a complete
conclusion about the manufacturing adjustments based on the statistical software printout
shown below.