Appendix 6.1 Using Minitab to Construct Confidence Intervals

Constructing the Confidence Interval Estimate for the Mean

To construct the confidence interval estimate of the mean time to process insurance applications illustrated in Figure 6.4 on page 103, open the INSURANCE-TIME.MTW worksheet. Select Stat → Basic Statistics → 1-Sample t:

  1. In the 1-Sample t (Test and Confidence Interval) dialog box (see Figure A6.1), select the Samples in columns: edit box, and enter C1 or Time. (If you have summarized data instead of the actual data, select the Summarized data option button and enter values for the sample size, mean, and standard deviation.)

    Figure A6.1. Minitab 1-Sample t (Test and Confidence Interval) Dialog Box
    [View full size image]

  2. Click ...

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