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366 Part V: Appendices
Continued
7. In the dialog box entitled U Chart there are several options available such as Scale
and Labels. Thus, for instance, if you select the Label option a new dialog box will
appear where you can enter the title of the u chart and any footnotes that you
would like to see on the output of the u chart and then click OK. By default the
title will be such as U Chart for C1 or U Chart for “name of the variable” if you
have given such name (say, nonconformities) in column C1 of the data window.
Use the option U Chart Options, for example, if you want to specify the mean
value of nonconformities per unit in the population instead of estimating it using
the given data. Then, click OK in the U Chart dialog box. The desired u control
chart will appear in the Session window. Thus, in our example the output of
the u chart is as shown in Figure 19.14 of Chapter 19, page 291.
Figure B.21 Minitab window showing the U Chart dialog box.
Except, in this case we enter the data on number of nonconforming in column
C1 and the corresponding sample sizes in column C2, and in step 6 instead of
entering the sample size in the box next to Subgroup Sizes we enter C2. For
an example, see the u chart of nonconformities for the data in Table 19.9, shown in
Example 19.11 as Figure 9.15, page 293.