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7 Data analysis
Analyzing data in a graph
To clear the annotation, touch the Coordinates button again. To clear the selection, touch the
Select button again.
Finding the slope at a point on a data plot
Complete these steps to display the slope at a selected point:
1. If more than one data run is displayed, first select a run:
a. Touch the graph legend.
The legend enlarges.
b. In the legend, touch the symbol of the run that you want to select.
The red outline moves to the selected run.
2. Touch the Graph Tools button to open the tool palette.
3. Touch the Slope Tool button.
The Slope Tool appears on the graph displaying the slope at one point.
The Slope Tool appears in the middle of the data run or, if part of the data run has been
selected, in the middle of the selected part.
4. Touch the arrows of the point selector to move the slope tool to nearby points.
To hide the Slope Tool, touch the Slope Tool button again.
Finding the correlation coefficient (r)
To find the correlation coefficient (r):
If more than one data measurement run is displayed, first select a measurement run:
1. Touch the line graph legend.
The legend enlarges.
2. In the legend, touch the symbol of the measurement run to analyze.
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