Question

A fleet manager wanted to determine the best replacement tires for their corporate automobiles. He selected six tire-types and had a set of each of them installed randomly on 23 selected automobiles. He then recorded the mileage when the tires came due for replacement. Use the Excel output below to analyze the data. Are there differences in life-time mileages of tires, at the five percent significance level?

ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups		5	8217.22
Within Groups			1592.3
Total	68155.2	22

What should be the fleet manager's conclusion on the six tire types?

		All six tire-types give the same mileage.
		Some of the tire-types give the same mileage.
		All six tire-types give different mileage.
		Not all the tire-types give the same mileage.
		Cannot be determined, need more information.

Answer 1