Save Score: 0 of 1 Calcium is essential to free 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 12 milligrams per liter (mol. ) A random sample of 10 precipitation dates in 2007 results in the following data table, Complete parts (a) through (6) below TH Click the Icon to view the data table (a) State the hypotheses for determining il the mean concentration of calehen precipitationt has changed since 1990 7 0 12 mail |9 12 mo/L Click to select your answers/ and then click Check Answer Help Me Solve This View an Example Get More Help - Clear All Type here to search 1:13 PRE p