fleet manager wanted to determine the best replacement tires for their corporate
ID: 3371326 • Letter: F
Question
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 is the critical value of the test statistic?
Round to four decimals.
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
Explanation / Answer
Ho: there is no significant difference in the mean lifetime mileage of 6 tires types.
H1: at least one of the six tyre type differ significantly in the mean lifetime mileage.
With F=5.156, P<5%,I reject the null hypothesis at 5% level of significance and conclude that at least one of the six tyre type differ significantly in the mean lifetime mileage
ANOVA Source of Variation SS df MS F P-value F crit Between Groups =8217.22*5 5 8217.22 =8217.22/1592.3 0.00463 2.8099962 Within Groups =1592.3*17 =22-5 1592.3 Total 68155.2 22Related Questions
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