15
Now we will practice curve fitting on top of the scatter plot. Remember to keep in mind
the maximum and minimum y values or temperatures. (E.G.: Minimum 5, Maximum 25).
Try and type in Y1=X+20. This will be a linear function that goes right through the
scatter plot. Hopefully you realize this is not a good guess, but will give you an initial
feeling for what values or equations you might want to type in.
Warning!!! Do not scroll around on the graph or change the window whatsoever.
You must keep the window the same, and only change your graph to fit the data.
Otherwise you are causing your guess to not fit the sampled data, but instead a
random window that you have created by scrolling.
If you have a good mathematical feel for the relationship, you will realize that it is
“Inverse” and fits the form.
Y=A/X
P
+B
Where P will affect to rate of curve or the steepness, and B will affect the intercept or
upward shift of the graph. Have the workshop participants try many different A’s, P’s,
and B’s to see if they can get a curve that will roughly fit the data. Now return to the
setup menu for Graph and turn the background back to off. You should now have an idea
how to setup a scatter plot, Do some simple regressions, save a scatter plot as a
background, and then curve fit on top.
Questions to Review Transmitting Data and Analyzing the Data.
1. What might create the error message “Com error”?
2. In what order is the data transferred? For example does time come before channel one
or after?
3. If nothing was transmitted and both lists are blank, how can you fix the problem?
4. What is the fastest way to change from, “receive (list 1)” to receive (list 2)”?
5. How do you change the setup of a scatter plot, lets say I want List1 to be
independent?
6. How many pictures can be saved on the Graphing calculator?
7. How do you save a picture and then recall it as a background?
8. Why is it important to pay attention to the range of samplings that you have taken?
(E.G.: Maximum and Minimum Temperature)
Extended Activity: So far we have used the light probe (Twinkle, Twinkle), and the
Temperature Probe (Law of Cooling), Now I would suggest having the workshop
participants choose another probe, such as the motion detector, and the function of the
Data Logger in order to reaffirm what has been learned. In the back of the manual are 16
labs which can be used to not only investigate the mathematical and scientific phenomena
but can also help to reaffirm how to use the EA100. Being comfortable with technology is
very important today as we become more and more dependent upon it. The lab where the
motion detector is used to model various mathematical relationships, (linear graph,
exponential graph, step function, etc.) is an easy and fun one to use.
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