Vernier Original LabQuest - Manual (Page 5)

LabQuest Reference
3
point. You can make fine adjustments to the cursor location by using the left and right
cursor keys below the screen.
The Analyze menu enables additional ways to inspect
your data. Tap Analyze, and then tap Tangent. Now tap
near an interesting place on your graph; a tangent line is
drawn in addition to the examine cursors. On the right
side of the graph the numerical value of the slope is
shown.
To turn off the Tangent function, choose it again from
the Analyze menu.
Select a Region for Statistics
Some analysis functions allow you to select a range of
data. To select a range, use the stylus to drag across the
region of interest. Now you can perform tasks like
integrals, statistics, or curve fits. Try this: Drag across a
feature on your graph, and then select Statistics from
the Analyze menu, choosing the particular sensor or
column.
The graph now shows the selected region, and
descriptive statistics are displayed to the right of the
graph. You can remove the statistics display by choosing Statistics again from the Analyze
menu.
Select a Region for Curve Fit
Curve fits can also
start with a selection.
Otherwise, the entire
graph is used. To
perform a curve fit,
drag across a region
of the graph if you
want to make a
selection. Then
choose Curve Fit
from the Analyze menu. In the new screen, you will see your graph, as well as a menu of fit
equations. Display the equations by tapping the down-arrow to the right of the list. Tap
Linear to perform a linear fit to your data. The fit coefficients are shown. To place the fit on
your main graph, tap OK. The fit and its statistics are shown on the main screen.
Once you have performed a curve fit, you can use the Interpolate function to read values off
of the fitted function. Choose Interpolate, and tap on the graph. The examine lines now
locate a position on the fitted function, and coordinates along the fitted line are shown to