One way to study exposure to cigarette smoke is by measuring blood levels of serum cotinine, a metabolic product of nicotine that the body absorbs from cigarette smoke. Table 3 lists serum cotinine levels from samples of 50 smokers (“active smoke”) and 50 nonsmokers who are exposed to cigarette smoke at home or at work (“passive smoke”). Compare the two data sets (smokers and nonsmokers) with five-number summaries and boxplots, and discuss your results.

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TABLE 3 Serum Cotinine Levels (nanograms per milliliter of blood) in Samples of 50 Smokers and 50 Nonsmokers Exposed to Passive Smoke, with Data Values Listed in Ascending Order Order number Smokers Nonsmokers Order number Smokers Nonsmokers 123456 0.08 0.03 26 34.21 0.82 0.14 0.07 27 36.73 0.97 0.27 0.08 28 37.73 1.12 0.44 0.08 29 39.48 1.23 0.51 0.09 30 48.58 1.37 1.78 0.09 31 51.21 1.40 7 2.55 0.10 32 56.74 1.67 8 3.03 0.11 33 58.69 1.98 9 3.44 0.12 34 72.37 2.33 10 4.98 0.12 35 104.54 2.42 11 6.87 0.14 36 114.49 2.66 12 11.12 0.17 37 145.43 2.87 13 12.58 0.20 38 187.34 3.13 14 13.73 0.23 39 226.82 3.54 15 14.42 0.27 40 267.83 3.76 16 18.22 0.28 41 328.46 4.58 17 19.28 0.30 42 388.74 5.31 18 20.16 0.33 43 405.28 6.20 19 23.67 0.37 44 415.38 7.14 20 25.00 0.38 45 417.82 7.25 21 25.39 0.44 46 539.62 10.23 2222 29.41 0.49 47 592.79 10.83 23 30.71 0.51 48 688.36 17.11 24 32.54 0.51 49 692.51 37.44 25 32.56 0.68 50 983.41 61.33