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April 18, 2014

Homework Help: Statistics

Posted by Erik on Wednesday, November 7, 2012 at 3:20am.

Lead (Pb) concentrations were measured in waterfowl eggshell samples from two locations. In n1 = 41 samples from a location downstream from a paper mill, the mean Pb concentration was 1 x = 0.13 ppm with a standard deviation of s1 = 0.04 ppm. In n2 = 31 samples from a location upstream from the paper mill, the PB concentration was 2 x = 0.09 ppm with a standard deviation of s2 = 0.05 ppm. Test the hypothesis of no difference in mean Pb eggshell concentrations versus the alternative that the locations downstream from the papermill have a higher mean Pb concentration. Use a 1% level of significance.

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