7 Data analysis
Analyzing data in a graph
3. Touch the Select button.
The button turns orange.
4. Touch somewhere on the graph; then, within one second, touch somewhere else on the
graph.
The two locations that you touch define the corners of a selection box. A selection box
appears. Data points inside the box are highlighted.
5. Optionally, adjust the size and position of the selection box by dragging the handles at
the corners of the box.
6. When the desired data points are highlighted, touch OK.
The selection box disappears, but the points remain selected.
7. Touch the Coordinates button.
An annotation with the following information appears on the graph:
l
The x- and y-values of the first point in the selected range (
x1
and
y1
),
l
The x- and y-values of the last point in the selected range (
x2
and
y2
), and
l
The x- and y-differences between those two points (
dx
and
dy
).
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