PASCO SPARK Science Learning System User's Guide - Manual (Page 47)

D ATA ANALYSIS 39
A NALYZING DATA IN A GRAPH
7. Touch the Coordinates button.
An annotation with the following information appears on the graph:
• The x- and y-values of the first point in the selected range (x1 and y1),
• The x- and y-values of the last point in the selected range (x2 and y2), and
• The x- and y-differences between those two points (dx and dy).
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. See “Selecting part of a
data run for operation in a graph” on page 24.
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.