50 / 762
50
Chapter 1: Introduction and Graphical Displays
Section Review
Next we will discuss the stem-and-leaf plot where the actual data values are
used in the graphical display.
1-8 Stem-and-Leaf Plots or Displays
A stem-and-leaf plot displays the actual data values within the classes in the
plot. Because of this feature, this graph display has the advantage over the
histogram which gives the number of values within a given class but does
not list the actual values.
Definition: Stem-and-Leaf Plot or Display
A stem-and-leaf plot or a stem-and-leaf display is a data plot that uses part
of a data value as the stem to form groups or classes and part of the data
value as the leaf.
Note:
A stem-and-leaf plot has an advantage over a grouped frequency
distribution, since a stem-and-leaf plot retains the actual data by showing
them in the plot itself.
The next example will illustrate how a stem and leaf plot is constructed.
Example 1-11:
Consider the following values: 96, 98, 99, 106, 107, 108,
109, 109, 110, 112, and 114.
(a) Construct a stem-and-leaf display for the data using the unit digit values
as the leaves.
e-Self Review