Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in Chautauqua, New
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Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in Chautauqua, New York, was 0.11 milligram per liter (mg/L). A random sample of 10 precipitation dates in 2014 results in the following data:
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A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot does not show any outliers. Does the sample evidence suggest that calcium concentrations have changed since 1990? Use the α = 0.05 level of significance.
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Hypotheses It is given that the sample is random The r...View the full answer
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Related Book For 
Statistics Informed Decisions Using Data
ISBN: 9780134133539
5th Edition
Authors: Michael Sullivan III
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