124 Chapter 6: Statistical Plots
7306ENG.DOC Statistical Plots and Analyses Julie Hewlett Revised: 05/29/98 3:52 PM Printed: 05/19/99 9:00 AM
Page 124 of 20
Graph the test scores data from the Histogram example as a
Box plot. (See previous section, if necessary.)
1. Turn off all stat plots.
-e4b
2. Display the Stat Plots menu.
-e
3. Define Plot1 as a Box plot as
shown to the right.
1b#""""
""b#-v
SCORE b#
-vFREQ b
4. Display the stat plot using
the ZoomStat command.
(7
5. Trace the Box plot.
)
! and " (to trace
point to point)
Modified Box Plot Modified Box Plot Õ
The Modified Box plot functions exactly like the Box plot,
except it separates outliers from the plot. Outliers are those
data points which are 1.5¦Interquartile Range beyond the
quartiles. The Interquartile Range is defined as the difference
between the third quartile, Q3, and the first quartile, Q1.
Outliers are plotted individually beyond the whisker, using the
Mark you select from the Stat Plot editor. Outliers are included
in plot traces with ).
³
Select the
Ö icon.
Q1 Median point and its value