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348 Part V: Appendices
Continued
Figure B.8 Minitab Dotplot output for the data in Example B.4.
Scatter 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 > Scatterplot. These commands prompt
a dialog box entitled Scatterplots to appear, which has seven different options to
choose from. Choose the desired graph option and then click OK. Another dialog
box appears entitled Scatterplot - Simple. In this dialog box enter the names of
the variables under y variable and x variable. If you have not entered the names
of the variables in the data columns then under y variable and x variable just enter
the columns where you have entered the data, say C1, C2, and so on, and then
click OK. A separate graph is displayed for each set of variables. To display more
than one graph select the Multiple Graphs option and then choose the desired
display option.
The graph in Figure B.9 shows that although the plotted points are not clustered
around the line they still fall around the line going through them. This indicates
that there is only a moderate correlation between the test scores and the job
evaluation scores of the Six Sigma Green Belts.
Box and Whisker 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 > Boxplot or Stat > EDA >
Boxplot. These commands prompt a dialog box entitled Boxplot to appear with
four different graph options. Choose the desired option and then click OK.
Another dialog box appears entitled Boxplot - 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