There are four auto body shops in Shell River, Manitoba, all of which claim to serve customers promptly. 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 as follows:

Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the 0.05 significance level.

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Summary Groups Count Sum Average Variance Body Shop A Body Shop B 0.323333 15.4 5.133333 1.433333 4 32 Body Shop C Body Shop D 25.2 0.748 5.04 4 25.9 6.475 0.595833 ANOVA p-Value Source SS DF MS F Between groups Within groups 23.37321 9.612506 0.001632 3 7.791069 9.726167 12 0.810514 Total 33.09938 15