Listed below are the highway fuel consumption amounts (in mi gal) from cars in three different categories (from Data Set 16 in Appendix B). Use a 0.05 significance level to test the claim that the different car categories have the same median highway fuel consumption. Based on the results, does the number of cylinders appear to affect highway fuel consumption?

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Four cylinder 31 30 32 30 32 34 32 34 32 29 32 38 31 Six cylinder 26 29 29 27 27 25 25 30 37 32 31 27 Eight cylinder 25 25 25 27 25 25 25