A random sample of the closing stock prices in dollars for a company in a recent year is listed below. Assume that

is

$2.11.

Construct the

90%

and

99%

confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.

22.11	20.29	21.55	19.49	19.24	17.12	21.25	16.51
15.25	18.46	19.39	15.86	20.16	16.77	18.94	16.84