Question: For the data of Exercise 15.7, test the null hypothesis that the population mean operating costs per mile are the same for all three types

For the data of Exercise 15.7, test the null hypothesis that the population mean operating costs per mile are the same for all three types of automobiles without assuming normal population distributions.
In exercise

Domestic 18.0 15.6 15.4 19.1 16.9 Japanese 20.1 15.6 16.1 15.3 15.4 European 19.3 15.4 15.1 18.6 16.1

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