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Reports are available 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. 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 l.05.
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