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Hiding Observations |
Deselect all observations by clicking in any open area of a graph. |
Choose Edit:Windows:Renew to redisplay the scatter plot variables dialog. |
Click on GPA in the variables list and then click on the X button. |
This adds GPA to the X variables list.
Click the OK button. |
This creates two scatter plots, as
shown in Figure 9.9.
Click on the button at the lower left to display the scatter plot pop-up menu. |
Choose Observations to turn off the
display of observations in the scatter plot.
Figure 9.10: Scatter Plot Pop-up Menu
Do the same thing for the scatter plot on the right side. All the observation markers disappear, as shown in Figure 9.11.
Choose Edit:Observations:Find |
This displays the Find Observations dialog.
Select the variable SEX.
With the default values in the other lists,
this creates a test for SEX = Female.
Click the OK button. |
This selects all Female observations
and displays them in the scatter plots.
Choose Edit:Observations:Invert Selection. |
Invert Selection deselects all selected
observations and selects all deselected observations.
Now the scatter plots show all
observations where SEX is Male.
Toggling observations in the scatter plots shows there are more females than males in these data. The female students appear to have slightly higher scores on the mathematics portion of the SAT exam.
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