The Intercity Bus Company is concerned with the high cost
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):
 = 12.4 - .11X sb = .007 Sy|x = .41 r2 = .98
 = 50 sx = 15
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.
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