Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.15 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below. E Click the icon to view the data table (a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990. Но 0.15 mg/L V0.15 mg/L

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