If you are given summary statistics for a sample and want to construct a confidence interval, this can be done through the Probability Calculator in Geogebra, or Stat>Basic Stats>1-sample Z in Minitab(web). For Minitab (web), see Tutorials in D2L. For Geogebra, follow the directions below: Open it and click the "Statistics" tab just above the graph. For a confidence interval for a population mean, with unknown o, click the drop-down menu near the top (default is "Z Test of a Mean") anc choose "T Estimate of a Mean." Enter the confidence level (in decimal form), sample mean, sample standard deviation, and sample size. We'll use a sample with x = 65.17 s = 3.654, n = 26. Based on this sample data, a 95% confidence interval for the population mean is: 63.7655 <µ < 66.5745 The margin of error for this 95% confidence interval is 1.4045 Based on this sample data, a 99% confidence interval for the population mean is: 63.3212 < µ < 67.0188 1.8488 The margin of error for this 99% confidence interval is

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