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 0.11milligrams 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.

The data table:

0.068

0.074

0.063

0.276

0.116

0.173

0.134

0.227

0.336

0.102

​(a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990.

Upper H 0​:muμ =0.11

Upper H 1 muμ ≠ 0.11 ​

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

The lower bound is?

The upper bound is?

I just need the lower and upper bounds, I can't figure these out.

Answer 1