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Chapter 1: Introduction and Graphical Displays
29
Section Review
1-3 Dot Plots
Another graphical display which we can use to display data is called a
dot
plot
. A dot plot is useful when the data values are discrete and the range of
the values is small.
Definition: Dot Plot
A dot plot is a plot which displays a dot for each value in a data set along a
number line (usually horizontal). If there are multiple occurrences for a
specific value, then the dots will be stacked vertically above that value.
Example 1-5
:
Construct a dot plot for the information given in
Example 1-2
.
Solution:
Figure 1-14
shows the dot plot for the data set. We can use the
Dot Plot from Raw Data
workbook to create the graph. The graph was
edited to look the way it does in the figure. Observe that since there are
multiple occurrences of specific observations, the dots are stacked vertically.
The number of dots represents the frequency count for a specific value. For
instance, the value of 3 occurred 6 times since there are 6 dots stacked above
the value of 3.
e-Self Review