The article "Solid-Phase Chemical Fractionation of Selected Trace Metals in Some Northern Kentucky Soils" (A. Karathanasis and J. Pils, Soil and Sediment Contamination, 2005:293-308) presents pH measurements of soil specimens taken from three different types of soils. The results in the following table are consistent with means and standard deviations reported in the article.

a. Construct an ANOVA table. You may give a range for the P-value.
b. Can you conclude that there are differences among the mean pH levels?

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Soil Type Alluvium Glacial Til 6.07, 6.07, 5.36, 5.57, 5.48, 5.27, 5.80, 5.03, 6.65 Residuum pH Measurements 6.53, 6.03, 6.75, 6.82, 6.24 6.03, 6.16, 6.63, 6.13, 6.05, 5.68, 6.25, 5.43, 6.46,6.91, 5.75, 6.53