Avis Rent A Car maintains a fleet of low-mileage cars for its customer base. Suppose that Avis would like to promote the fact that its cars have a lower average mileage than that of its competitors in an advertising campaign.

To support this claim, Avis has collected the following mileage data from a random sample of rental cars from its own fleet and the fleets of three competitors. Hint: To help make the calculations more manageable, consider converting the mileage into thousands of miles (for example, 13,100 = 13.1). These data can also be found in the Excel file Avis.xlsx.

Avis Hertz National Enterprise 13,100 15,900 15,300 14,500 7,800 11,400 21,800 20,000 10,400 5,600 18,100 17,400 14,600 10,100 12,800 24,800 8,600 16,000 20,500 16,300

a. Using a = 0.05, determine if there is a difference in the average mileage between these four companies.

b. Using a = 0.05, determine if there is evidence to support the claim made by Avis.

c. Verify your results with Excel or PHStat.

AppendixLO1