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0.3.27 Question Help 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. EB 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. Ho : μ = 0.15 mg/L H: H0.15 mg/l (b) Construct a 90% confidence interval about the sample mean concentration of calcium precipitation The lower bound is The upper bound is (Round to four decimal places as needed.) Data Table 0.176 0.109 0.2430.327 0.119 Print Done ining
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An Given thay8 for calouatons ue we ercel rn Stc 90% coneidence inteval for Hẵn 2 2 to om t table oe can ind tg,0.05 ニ 1.8331 (0-198-118331 X o: 0235) → | 0.1076 , 0.2084) bp per bound so 42084 LOLDOR bound0 1076C18 x (x-xbar)A2 0.077 0.006529 0.087 0.005013 0.067 0.008245 0.245 0.007604 0.128 0.000888 0.176 0.000331 0.109 0.002381 0.243 0.007259 0.327 0.028629 0.119 0.001505 5 7 10 12 sum= 1.578 0.068 0.158 13 mean 14 15

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