To display a dotplot with groups
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1    Choose Graph > Dotplot.

2    Choose One Y - With Groups, then click OK.

3    In Graph variables, enter one or more columns of data. Minitab displays a separate graph for each column.

4    In Categorical variables for grouping (1-4, outermost first), enter one to four columns of grouping (categorical) variables. The first variable will be the outermost and the last will be the innermost.

5    If you like, use any dialog box options, then click OK.