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Unformatted text preview: 1 1. Independent random samples were taken from two populations of policemen with blood lead concentration measured in each sample member. One sample of 26 policemen sub jected to constant inhalation of automobile exhaust fumes in downtown Vancouver had an average blood lead concentration of 20.0 mg/dl with a standard deviation of 7.5 mg/dl; the other sample of 25 policemen from rural Vancouver Island with no history of lead exposure had an average blood level concentration of 15.0 mg/dl and standard deviation of 8.5 mg/dl. (a) Test whether downtown Vancouver policemen have, on average, higher blood lead concentrations than policemen in rural Vancouver Island. State null and alterna tive hypotheses, value of the test statistic and pValue. You can assume that the population variances are the same. H : 1 2 = 0 versus H A : 1 2 > Here 1 represents downtown Vancouver and 2 represents rural Vancouver Is land....
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 Spring '12
 daniel

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