Plotting a Single Column

A histogram of the data can be produced by using the DOTPLOT command in MINITAB. Type:

DOTPLOT column

For example, we might want to plot our improvement in test scores. Type:

MTB> DOTPLOT 'IMPROV'

        :    .      . .:.:..:.   .   .    .      .      .
-+---------+---------+---------+---------+---------+-----IMPROV
-24 -12 0 12 24 36

We see that the improvement scores fall on both sides of zero, indicating some people did worse on the fourth test than on the first one. Also, there are only a few people that gained a great deal from the first test to the fourth one: the gain for most was very small.

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