The addition of MMT, a compound containing manganese (Mn), to gasoline as an octane enhancer has caused

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The addition of MMT, a compound containing manganese (Mn), to gasoline as an octane enhancer has caused concern about human exposure to Mn because high intakes have been linked to serious health effects. In a study of ambient air concentrations of fine Mn, Wallace and Slonecker (Journal of the Air and Waste Management Association) presented the accompanying summary information about the amounts of fine Mn (in nanograms per cubic meter) in mostly rural national park sites and in mostly urban California sites.

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a. Is there sufficient evidence to indicate that the mean concentrations differ for these two types of sites at the α = .05 level of significance? Use the large-sample z-test. What is the p-value of this test?

b. Construct a 95% confidence interval for (μ₁ - μ₂). Does this interval confirm your conclusions in part a?

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a The hypothesis of interest is twotailed H 0 1 2 0 ver...View the full answer

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