Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In1990, the concentration of calcium in precipitation in a certain area was 0.12

0.12 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.

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

Upper H 0

H0: mu

equals

=

0.12

0.12 mg/L

Upper H 1

H1: mu

not equals

0.12

0.12 mg/L

(b) Construct a 98

98% confidence interval about the sample mean concentration of calcium precipitation.

The lower bound is

0.0773

0.0773.

The upper bound is

0.2281

0.2281.

(Round to four decimal places asneeded.)

I can't figure out the lower and upper bounds to this.