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This tutorial demonstrates how to create a scatterplot and determine the line of best fit using Desmos. The process involves adding a table, inputting data, adjusting the viewing window, and manipulating the slope and y-intercept sliders to find the best fit line. This tutorial was presented at Ingham ISD.
What you will learn
Typology: Slides
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During my Desmos presentation at Ingham ISD, I modeled a data set using a scatterplot and then drew a best fit line to the data set. This tutorial will demonstrate that process.
To review:
Here is the data set we are exploring.
Step 1: Go to www.desmos.com
Step 2: Click
Step 3: Add a table. Click here first. Then here.
Step 4: Add values to table. This can be done with keyboard and arrows.
Step 5: Change the viewing window by updating the max and min. Click on the numbers and type new ones in
Now you should see points
You would be seeing the points plotted as you entered the numbers into the table, but...
Your coordinate plane has default settings set.
We need to change them.
Click and drag the slider all the way to the right. Now m = 10, which isn’t a steep enough slope. We need to be able to keep sliding the slider to the right.
Step 8: Working the slider to create the best fit line.
Click here and change “ 10 ” to “ 25 ”
to reassign the upper bound of the slider.
Step 9: Using slider, adjust slope and y-intercept until you are happy with your best fit line.
Step 10: Estimating the cost to host 11 people.
To see the lesson or presentation associated with this tutorial check out thegeometryteacher.wordpress.com/ingham-isd
Click and hold on the line. This will show the ordered pair at the point you clicked.
