Question: Refer to Data Set 9 in Appendix B. Use a 0.01 significance level to test the claim that the populations of cotinine levels are identical

Refer to Data Set 9 in Appendix B. Use a 0.01 significance level to test the claim that the populations of cotinine levels are identical for these three groups: nonsmokers who are not exposed to environmental tobacco smoke, nonsmokers who are exposed to tobacco smoke and people who smoke. What do the results suggest about second-hand smoke?
Use the Kruskal-Wallis test.

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