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Before a substance can be deemed safe for landfilling, its chemical properties must be characterized. The article: Landfill Ash/Sludge Mixtures (J. Benoit, T. Eighmy, and B. Crannell, Journal of Geotechnical and Geo-environmental Engineering, 1999; 877-888) reports that in a sample of 6 replicates of sludge from a New Hampshire wastewater treatment plant, the mean pH was 6.68 with a standard deviation of 0.20. Can we conclude that the mean pH is less than 7.0? Use a- 0.05. 3.
math   Statistics-And-Probability   
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Lisi n mpl an tc the Sample T 66 60 00 200o 6.8231 -3-92006 ,

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