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346 Part V: Appendices
the option Simple, and then click OK. Another dialog box will appear entitled
Histogram Simple. In this dialog box enter one or more variables under Graph
Variables. If you have not entered the names of the variables in the data columns
then under Graph Variables just enter C1, C2, and so on, and then click OK. A
separate graph is displayed for each variable. To display more than one graph
select the Multiple Graphs option and then choose the desired display option.
Sometimes we are interested in constructing a histogram with a particular
number of classes or intervals, say five. Right-click on one of the bars in the default
histogram to bring up the Edit Bars dialog box shown in Figure B.6.
In the Edit Bars dialog box select the Binning tab and then under Interval
Type check the circle next to Midpoint. Then under Interval Definition check the
circle next to Number of Intervals and then enter the number of desired intervals
in the box next to it, five in this example. Click OK. The output will appear in the
graph window as shown in Figure B.7.
Dot Plot. First enter the data in one or more columns of the worksheet depending
on how many variables you have. For each variable use only one column. Then
use the menu commands Graph > Dotplot. These commands prompt a dialog
box entitled Dotplots to appear, which has seven different options to choose
from. Choose the desired graph option and then click OK. Another dialog box
appears entitled Dotplot – One Y, Simple. In this dialog box enter one or more
variables into Graph Variables. If you have not entered the names of the variables
in the data columns then under Graph Variables just enter C1, C2, and so on,
and then click OK. A separate graph is displayed for each variable. To display more
than one graph select the Multiple Graphs option and then choose the desired
display option.
Figure B.6 Minitab window showing Edit Bars dialog box.