Refer to Problem 19.8. Intercity buses travel 8,200 miles a week. Current miles per gallon for buses is 5.1. Provide an estimate of the amount of money that could be saved in a week (with a 55-mph governor) if fuel costs $2 per gallon. Place 95% confidence limits around this estimate.

Data in Problem 19.8.

The Intercity Bus Company is concerned with the high cost of fuel. The company believes that fuel is being wasted because drivers are exceeding the speed limit. A series of tests (N = 85) shows the following relationship between bus speed (X) and miles per gallon of fuel (Y) for speeds between 35 and 85 miles per hour (mph): 

Intercity is considering placing a governor on all buses, limiting their speed to 55 mph. At an average speed of 55 mph, how many miles per gallon would a bus get? Place a 95% confidence limit around this estimate.

y = 12.4.11X S = .007 Sylx = = X = 50 Sx = 15 .41 = 98