Cotinine levels were measured in a group of smokers (n = 31, x = 172.48 ng/ml, s = 119.50 ng/mL) and a group of nonsmokers not exposed to tobacco smoke (n = 41, x = 16.35 ng/ml, s = 62.53 ng/mL). Cotinine is a metabolite of nicotine, meaning that when nicotine is absorbed by the body, cotinine is produced. Test the claim that the variation of cotinine in smokers is greater than the variation of cotinine in nonsmokers not exposed to tobacco smoke. Use a 0.05 significance level. . What is the critical value? A. 1.84 B. 2.39 C. 1.74 D. 2.20 . What is the test statistic and conclusion? A. 3.65; Reject Ho B. 3.65; Fail to reject Ho C. 3.07; Reject Ho D. 3.07; Fail to reject Ho