Question

10.3.27 Question 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 0.12 milligrams per liter (n random sample of 10 precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below 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 H: = 0.12 mg/l 0.12 mg/l (b) Construct a 95% 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.) Enter your answer in the edit fields and then click Check Answer Clear All part remaining Type here to search t e mea • Oo w

Answer 1

Given, M = 0.12 milligram m= 10 0.06 0.078, 0.064, 0.255 0.242, 0.318 0.106 X: 0.121, 0.179, 0-102, X = 2X = 0.1531 s= E(XI-X) = 0.008047435 Ant ie S= 0.08970749 @ The hypothesis for determining the mean concentration of calcium porecipitation has changed since 1990 or not Hoi M 0:12 milligram Hp: U 0.12 milligram ® 95% confidence interval concentration of calcium elle Ž I toon about the sample mean precipitation is, ME x + tors, ats I E 0.1581 + 2.262157 * 0.08970749 Vio u E 0.1531+ 0.0842 ie- 10.0889 < M < 0.2173 Mere confidence interval does not contain 'zero!! . we have sufficient evidence to reiect Ho per we can say that the mean concentration of calcium poecipitation has changed since 1990,