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There are four auto body shops in a community and all claim to promptly serve customers. To check if there is any difference in service, customers are randomly selected from each repair shop and their waiting times in days are recorded. The output from a statistical software package is:
Summary
Groups
Count
Sum
Average
Variance
Body Shop A
3
15.4
5.133333
0.323333
Body Shop B
4
32
8
1.433333
Body Shop C
5
25.2
5.04
0.748
Body Shop D
25.9
6.475
0.595833
ANOVA
Source of Variation
SS
df
MS
F
p-value
Between Groups
23.37321
7.791069
9.612506
0.001632
Within Groups
9.726167
12
0.810514
Total
33.09938
15
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
Use the .05 significance level.
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