Comparing means of three or more groups

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Reference no: EM1320434

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	4	25.9	6.475	0.595833

ANOVA
Source of Variation	SS	df	MS	F	p-value
Between Groups	23.37321	3	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.

Reference no: EM1320434

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