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Graphing Scatter Plots and Finding Trend lines
GraphingIn order to create a scatter plot on the
calculator we must first do two things
1) Turn plot one on
2) Change the zoom setting to zoomstat
Turning Plots on (TI-84+)
1) Turn the calculator on
2) Hit the “Stat Plot” key (“2nd” + “Y=”)
3) Hit enter on plot 14) The curser should
be blinking over the word “On”
5) Hit “Enter”
Setting Zoom (TI-84+)
1) Hit the zoom button and select choice 9 “ZoomStat”
Creating Scatter Plots (TI-84+)
1) Hit the “stat” button
2) Hit “enter” at choice 1: Edit…
Creating Scatter Plots (TI-84+)3) Enter the data into L1
and L2. The domain (x-values) go into L1 and the range (y-values) go into L2
**Make sure that the domain value is right next to the corresponding range value
Creating Scatter Plots (TI-84+)
4) Hit “Graph”
Finding Trend Line (TI-84+)
1) Hit the “Stat” button
2) Hit the right arrow once to select “Calc”
3) Select choice 4: ‘LinReg(ax +b)’
4) Hit “Enter”5) Hit “Enter”
again
Finding Trend Line (TI-84+)
6) The calculator will now display what “a” and “b” equals. “a” is the slope of the trend line and “b” is the y-intercept
Finding Trend Line(TI-84+)
To graph the trend line:
1) Hit “Y=”
2) Hit “VARS”
3) Select choice 5: “Statistics”
4) Hit “Enter”
Finding Trend Line (TI-84+)
5) Hit the right arrow twice to select “EQ” at the top
6) Select choice 1: “RegEQ”
7) Hit “Enter”
Graphing Trend Line (TI-84+)
8) The equation of the trend line will now appear on the “Y1” line
9) Hit the graph button to see the graph
Graphing – Method 2 (TI-89)
10) The scatter plot and trend line should now appear
DONE
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