The article Measuring the Exposure of Infants to Tobacco Smoke (New England J. of Medicine, 1984: 1075-1078)
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The article "Measuring the Exposure of Infants to Tobacco Smoke" (New England J. of Medicine, 1984: 1075-1078) reports on a study in which various measurements were taken both from a random sample of infants who had been exposed to household smoke and from a sample of unexposed infants. The accompanying data consists of observations on urinary concentration of cotanine, a major metabolite of nicotine (the values constitute a subset of the original data and were read from a plot that appeared in the article). Does the data suggest that true average cotanine level is higher in exposed infants than in unexposed infants by more than 25? Carry out a test at significance level .05.
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Let 1 and 2 denote true average cotanine levels in unexposed an...View the full answer
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