Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in a certain area was 0.12 milligrams per liter A random sample of 10 precipitation dates in 2018 results in the following data table. Com parts (a) through (c) below. (a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990. Ho: V0.12 mg/L V0.12 mg/L mg (b) With 99% confidence, the mean concentration of calcium in precipitation in this area in 2018 is between and (Use ascending order. Round to four decimal places as needed.) (c) Does the sample evidence suggest that calcium concentrations have changed since 1990? O A. No, because the confidence interval contains 0.12 16 O B. No, because the confidence interval does not contain 0.12 mg OC. Yes, because the confidence interval does not contain 0.12 mg O D. Yes, because the confidence interval contains 0.12

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