Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in Chautauqua, New York, was 0.11 milligram per liter random sample of 8 precipitation dates in 2018 results in the following data: 0.126 0.120 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. 0.087 0.313 0.183 What are the null and alternative hypotheses? но: н 0.11 H₁: H 0.11 (Type integers or decimals. Do not round.) Find the test statistic. to = (Round to two decimal places as needed.) 0.070 0.108 mg L 0.262

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