1 Choose Graph > Boxplot.
2 Under One Y, choose With Groups. 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 is the outermost on the scale and the last variable is the innermost.
5 If you like, use any dialog box options, then click OK.