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B. Alternate Activity/Analyzing the Data Using the 9850G Graphing calculator.
Instructors Directions: We will now set up a scatter plot in order to get a visual
picture of the represented data. Have the calculator perform some simple
regressions in order to fit the data. We will also save the scatter plot as a
background and then try to fit a curve to the data, by typing in your own guess and
see if it close.
Setting Up a scatter plot on the 9850G. You should have time listed in List 1, and
temperature values in List 2. Make sure you are viewing each list from the Statistics area.
Set up a scatter plot using List 1 for x values and List 2 for y values.
1. From Main Menu: Select 2 for statistics.
2. Choose F4 to select graph 1 as being on.
3. Choose F6 to setup the graph.
4. Choose Scatter, List 1, List 2, and Mark type=a single dot.
5. Exit out, and go to the Setup area for statistics (shift, menu) and choose Auto window.
6. Now look at the scatter plot (Graph 1).
It should display all of the data points in a somewhat curved relationship. Select the view
window and make a note of the range of x values and range of y values. This is very
important to keep in mind, later, when we are going to guess a curve that fits.
7. While looking at the scatter plot, try some of the built in regressions to see if any
represent the law of cooling. Does this relationship/graph have a name? (exponential,
logarithmic, inverse, etc.?)
Goal: Save the Scatter Plot as a picture to later recall as a background.
While looking at the Scatter Plot. Select OPTN, to bring up the Picture menu. Select F1
for Pict. F1 for store, and then F1 for Picture 1. The scatter plot is now saved as picture
one and can be later recalled or manipulated.
Goal: To recall the Scatter Plot as a background in the graphing window and then
to curve fit on top of it.
From the main menu, select 5 for Graph. You should now see the equation edit screen.
Y1, Y2, etc. We must choose Picture 1 (The saved scatter plot) as our background. So
go to the setup area, Shift, Menu.....arrow down to the background choice line and instead
of having “None” choose Pic1. This will always recall the Scatter Plot in the background
until you return to the setup menu for graph and turn the background off.
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