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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.
-e
4
b
2. Display the Stat Plots menu.
-e
3. Define
Plot1
as a Box plot as
shown to the right.
1
b#""""
""b#-v
SCORE
b#
-v
FREQ
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,
Q
3
, and the first quartile,
Q
1
.
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