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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
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 8 precipitation dates in 2018 results in the following data:
0.087 | 0.126 | 0.234 | 0.065 | 0.262 | 0.120 | 0.108 | 0.070 |
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 a=0.1 level of significance.
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