6 Using Technology to Construct Confidence Intervals Here are some Minitab and TI-84 Plus printouts for some examples in this chapter. Answers may be slightly different because of rounding. 344 CHAPTER 6 Confidence Intervals Display Descriptive Statistics... Store Descriptive Statistics... 2-Sample t... Paired t... 1 Proportion... 2 Proportions... 1-Sample Z... 1-Sample t... Graphical Summary... See Example 3, page 301. 19 18 18 15 21 21 23 20 21 19 16 19 22 15 19 24 20 24 20 17 18 17 19 20 20 20 22 24 22 23 23 21 22 20 17 21 16 18 18 25 MINITAB One-Sample Z: Hours Descriptive Statistics N Mean StDev SE Mean 95% CI for μ 40 19.925 2.556 0.379 (19.181, 20.669) μ: population mean of Hours Known standard deviation = 2.4 See Example 2, page 312. Display Descriptive Statistics... Store Descriptive Statistics... 2-Sample t... Paired t... 1 Proportion... 2 Proportions... C l ti 1-Sample Z... 1-Sample t... Graphical Summary... MINITAB One-Sample T Descriptive Statistics N Mean StDev SE Mean 95% CI for μ 16 162.00 10.00 2.50 (156.67, 167.33) μ: population mean of Sample Display Descriptive Statistics... Store Descriptive Statistics... 2-Sample t... Paired t... 2 Proportions... C l ti 1-Sample Z... 1-Sample t... Graphical Summary... 1 Proportion... See Example 2, page 322. MINITAB Test and CI for One Proportion Method p: event proportion Exact method is used for this analysis. Descriptive Statistics N Event Sample p 95% CI for p 540 378 0.700000 (0.661, 0.739)
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