Refer to Problem 24.

a. At the 5% significance level, do the data provide sufficient evidence to conclude that a difference in mean death and injured toll in earthquakes? Use the Kruskal–Wallis procedure to perform the required hypothesis test.

b. The hypothesis test in part

(a) was done in Problem 26 by using the one-way ANOVA procedure. The assumptions in that exercise are that, for the earthquakes, death and injured tolls are normally distributed and have equal standard deviations. Presuming that to be true, why is performing a Kruskal–Wallis test to compare the means permissible? In this case, is use of the one-way ANOVA test or the Kruskal–Wallis test better? Explain your answers.

c. Compare your hypothesis-testing results with the Kruskal–Wallis test to those of the one-way ANOVA test.