Question: 16.21 The following data represent the working times, in hours, of three brands of mobile phones before a recharge is required. Brand A 17.2 19.8

16.21 The following data represent the working times, in hours, of three brands of mobile phones before a recharge is required.

Brand A 17.2 19.8 16.1 16.4 17.6 Brand B 18.4 18.2 20.2 19.6 18.4 17.6 16.8 Brand C 21.4 22.8 18.6 21.8 20.6 22.6 Use the Kruskal–Wallis test, at the 0.01 level of significance, to test the hypothesis that the working times of all three brands of mobile phones are equal.

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