30. Significance of Fleet Size on Rental Car Revenue. Companies in the U.S. car rental market vary greatly in terms of the size of the fleet, the number of locations, and annual revenue. The following data were used to investigate the relationship between the number of cars in service (1000s) and the annual revenue ($ millions) for six smal- ler car rental companies (Auto Rental News website). Cars Revenue Company (1000s) ($ millions) U-Save Auto Rental System, Inc. Payless Car Rental System, Inc. ACE Rent A Car 11.5 118 10.0 135 9.0 100 Rent-A-Wreck of America 5.5 37 Triangle Rent-A-Car Affordable/Sensible 4.2 40 3.3 32 Source: Auto Rental News website, (https://www.autorentalnews.com/custom-content/253201/research-statistics) With x = cars in service (1000s) and y = annual revenue ($ millions), the estimated regression equation is ŷ = – 17.005 + 12.966x. For these data SSE = 1043.03 and SST = 10,568. Do these results indicate a significant relationship between the number of cars in service and the annual revenue?

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