A random sample of the closing stock prices in dollars for a company in a recent year is listed below. Assume that is $2.38. Construct the 90% and 99% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. 18.37 16.85 19.49 21.42 18.78 21.52 The 90% confidence interval is ($.$. (Round to two decimal places as needed.) 17.42 15.51 21.35 15.32 18.09 17.36 15.42 20.46 15.98 20.53

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