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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:

0.064, 0.088, 0.072, 0.239, 0.114, 0.184, 0.136, 0.214, 0.315, 0.106

a) Construct a 99% confidence interval about the sample mean concentration of calcium precipitation:

(____,____) (use ascending order, round to four decimal places)

b) Does the sample evidence suggest that calcium concentrations have changed since 1990?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9986548

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