Listed below are highway fuel consumption amounts (mi/gal) for cars categorized by the sizes of small, midsize,

Question:

Listed below are highway fuel consumption amounts (mi/gal) for cars categorized by the sizes of small, midsize, and large (from Data Set 14 in Appendix B). Using a 0.05 significance level, test the claim that the three size categories have the same median highway fuel consumption. Does the size of a car appear to affect highway fuel consumption? Use the Kruskal-Wallis test.