on the main dialog box (next to the Scale. If you want to get rid of the confidence interval curves, go to Distribution. Hit the OK button to return to the main dialog and then OK again to get the graph.In the Scale dialog box, go to the Y-Scale Type tab and choose Score.In the Scale dialog box, check the Transpose X and Y option on the front Axes and Ticks tab.In the dialog box, set up your desired graph variable.Hit OK for the default choice of Single.Some key information on P-P plots: Interpretation of the points on the plot: assuming we have two distributions (f and g) and a point of evaluation z (any value), the point on the plot indicates what percentage of data lies at or below z in both f and g (as per definition of the CDF). Here's steps you can take to have Minitab produce a plot in the same style as the text: Example of a P-P plot comparing random numbers drawn from N(0, 1) to Standard Normal perfect match. If most of the points fall within thecurves with a non-systematic scatter, assuming normality is probably fine. You can use these inmaking a judgment about normality. You don't need to worry about the precisemeaning of the 95% confidence interval curves. There are two ways of producing a normal probability plot in MINITAB. With the text's choices, granularity will show up aspoints lined up horizontally. Note that in MINITAB we can calculate probabilities for any (not just standard). With the Minitab default, granularity will show up as points linedup vertically. The central question remains the same: Towhat degree do the points fall along a straight line? The more the pointsfall along the line, the more closer the distribution is to being normal. curves corresponding to 95% confidence intervals are included in the Minitab default.the expected value is reported as a percentile rather than a z-score in the Minitab default.the axes are transposed so the data values are on the horizontal axis and the expected value is on the vertical axis in Minitab's default.The default format forprobability plots in Minitab differs from what the text uses in three ways: NQ Plots in Minitab Producing normal quantile plots in Minitab.Ī Probability Plot in Minitab serves the same purpose as a normalquantile plot as described in the text.
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