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Chapter 1: Introduction and Graphical Displays
Note that if we trace a smooth curve at the top of the leaves, it will reveal a
bell shape curve. Hence, not only does the stem-and-leaf plot display the
actual values in the data set, it displays the shape of the distribution of the
population from which the sample was obtained.
We can use the
Stem-and-Leaf Plot for Raw Data
workbook to help
construct the plot. Enter the values in the data column, and the plot will
automatically be constructed. The plot is shown in
Figure 1-25
.
Figure 1-25: Stem-and-Leaf Plot
for the data in
Example 1-11
Section Review
1-9 Time Series Graphs
Another type of graph which we can use to display data is called a
time series
graph. This type of graphical display is used to present
quantitative data collected over a period of time.
Click here for the Stem-and-Leaf Plot for Raw Data Workbook e-Self Review