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A random sample of the closing stock prices in dollars for

A random sample of the closing stock prices in dollars for a company in a recent year is listed below. Assume that sigma σ is ?$2.59. Construct the 90?% and 99?% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.

19.82 22.86 20.72 18.71 16.06 22.99 17.09 21.85

15.07 15.25 21.89 19.49 16.44 22.49 17.18 17.58

(1) The? 90% confidence interval is?

(2) The? 99% confidence interval is?

(3) Which statement below interprets the results? correctly?

(4) Which interval is? wider?

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