please help with #10

H mathxl.com v Take a Test - Ra." Rayvcnjohnson t | 04/25/2110151AM Time Remainln Submit Quiz This Question: 1 pt 4 10 of 10 (3 complete) 7 y This Quiz: 10 pts possible Question Help V 0 Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990. the concentration 01 calcium in precipitation in a certain area was 0.12 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 resulm in the following data table. Complete pars (a) through (0) below. a Click the icon to view the data table (a) State the hypotheses for determining ifthe mean concentration of calcium precipitation has changed since 1990, 0.12 mg/L 0.12 mg/L l