Instructions – Line of Best Fit
Instructions – Line of Best Fit
1. Calculator set up – Part 1
▪ Press “2nd,0” to bring up the catalog
▪ Scroll down and place the arrow next to “DiagnosticOn”
▪ Press “Enter” twice
(Note: This step only has to be done once during the activity)
2. Calculator set up – Part 2
▪ Press “2nd, +” to bring up the memory
▪ Press “4” to bring up “clrAllLists”
▪ Press “Enter”
3. Calculator set up – Part 3
▪ Press “2nd, Y=” (Top left button) to bring up stat plot
▪ Press “ENTER” twice to turn on the stat plots
4. Enter in your coordinates
▪ Press “stat” and “edit”
▪ Enter all of the x coordinates in the L1 column
▪ Enter all of the y coordinates in the L2 column
*Make sure your data is accurate!
5. Calculate data
▪ Press “stat” and use right arrow key to move to “calc”
▪ Scroll down to “linReg(ax+b)” and hit enter
▪ Press “2nd, 1” to bring up L1
▪ Press the “,” key (It’s the button directly above 7)
▪ Press “2nd, 2” to bring up L2
▪ Press the “,” key
▪ Press “VARS”, right arrow to move to “Y-VARS” and hit “ENTER” twice to bring up Y1
*The command line should look like this on the screen:
LinReg(ax+b) L1,
L2, Y1
▪ Press “ENTER”
Copy the data to your scatterplot data sheet
5. Graph the line of best fit
▪ Press “ZOOM” and scroll down to “ZoomStat”
▪ Press “ENTER”
Make sure your points coincide with the points on the graph.
Draw the line that’s on the calculator onto your grid.
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