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Appendix 7.2 Confidence Intervals Using MegaStat Appendix 7.2 ■ Confidence Intervals Using MegaStat Confidence interval for the population mean debt-toequity ratio: • Select Add-Ins : MegaStat : Confidence Intervals / Sample Size • In the “Confidence Intervals / Sample Size” dialog box, click on the “Confidence Interval—mean” tab. • Enter the sample mean (here equal to 1.3433) into the Mean window. • Enter the sample standard deviation (here equal to .1921) into the “Std Dev” window. • Enter the sample size (here equal to 15) into the “n” window. • Select a level of confidence from the pull-down menu or type a desired percentage. • Select a t-based or z-based interval by clicking on “t” or “z.” Here we request a t-based interval. • Click OK in the “Confidence Intervals / Sample Size” dialog box. Confidence interval for a population proportion in the cheese spread situation: • In the “Confidence Intervals / Sample Size” dialog box, click on the “Confidence interval—p” tab. • Enter the sample proportion (here equal to .063) into the “p” window. • Enter the sample size (here equal to 1000) into the “n” window. • Select a level of confidence from the pull-down menu or type a desired percentage. • Click OK in the “Confidence Intervals / Sample Size” dialog box. Sample size determination for a proportion problem: • In the “Confidence Intervals / Sample Size” dialog box, click on the “Sample size—p” tab. • Enter the desired margin of error (here equal to 0.02) into the “E” window and enter an estimate of the population proportion into the “p” window. • Select a level of confidence from the pull-down menu or type a desired percentage. • Click OK in the “Confidence Intervals / Sample Size” dialog box. Sample size determination for a population mean problem is done by clicking on the “Sample Size— mean” tab. Then enter a desired margin of error, an estimate of the population standard deviation, and the desired level of confidence. Click OK. 1