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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