Refer to Data Set 12 “Passive and Active Smoke” in Appendix B and use the measured serum cotinine levels (in mg>mL) from the three groups of subjects (smokers, nonsmokers exposed to tobacco smoke, and nonsmokers not exposed to tobacco smoke). When nicotine is absorbed by the body, cotinine is produced. Use a 0.05 significance level to test the claim that the three samples are from populations with the same mean. What do the results suggest about the effects of secondhand smoke?

Data Set 12: Passive and Active Smoke 

Data are from 120 subjects (first five rows shown here) in three groups: SMOKER includes subjects who are smokers, ETS includes nonsmokers exposed to environmental tobacco smoke, NOETS includes nonsmokers not exposed to environmental tobacco smoke. All values are measured levels of serum cotinine (in ng>mL), a metabolite of nicotine. (When nicotine is absorbed by the body, cotinine is produced.) Data are from the U.S. Department of Health and Human Services, National Center for Health Statistics, Third National Health and Nutrition Examination Survey.