A reseаrcher wаs interested in studying secоndhаnd smоke. She randоmly selected 41 subjects across three groups: smokers, ETS (nonsmokers exposed to environmental smoke at home or work), and NOETS (nonsmokers with no exposure to smoke at environmental smoke at home or work), and measured the serum cotinine (in ng/ml), a metabolite of nicotine (when nicotine is adsorbed by the body, cotinine is produced) for each group. Using a 0.05 significance level, test the claim that the mean cotinine level is different for these three groups. If a statistical difference is found between the groups, clearly identify which group(s), if any, are different using the appropriate test. The data set is label Secondhand Smoke in My Groups in StatCrunch. Source: U.S. Department of Health and Human Services, National Center for Health Statistics, Third National Health and Nutrition Examination Survey. State the null and alternative hypotheses for this situation.