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Question: calcium is essential to tree growth because it promotes the...

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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 0.11 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.

0.073
0.082
0.086
0.231
0.129
0.187
0.133
0.207
0.322
0.092

Construct a 95% confidence interval about the sample mean concentration of calcium precipitation.

The lower bound is

The upper bound is

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