A dealer has in stock three cars (models A, B, and C) of
Chapter 13, Problem 80SE(choose chapter or problem)
A dealer has in stock three cars (models A, B, and C) of the same make but different models. Wishing to compare mileage obtained for these different models, a customer arranged to test each car with each of three brands of gasoline (brands X, Y, and Z). In each trial, a gallon of gasoline was added to an empty tank, and the car was driven without stopping until it ran out of gasoline. The accompanying table shows the number of miles covered in each of the nine trials.
a Should the customer conclude that the different car models differ in mean gas mileage? Test at the \(\alpha=.05\) level.
b Do the data indicate that the brand of gasoline affects gas mileage?
Equation transcription:
Text transcription:
alpha=.05
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