# Graphing Scatter Plots and Finding Trend lines

## Presentation on theme: "Graphing Scatter Plots and Finding Trend lines"— Presentation transcript:

Graphing Scatter Plots and Finding Trend lines

Graphing In order to create a scatter plot on the calculator we must first do two things Turn plot one on Change the zoom setting to zoomstat

Turning Plots on (TI-84+)
Turn the calculator on Hit the “Stat Plot” key (“2nd” + “Y=”) Hit enter on plot 1 The curser should be blinking over the word “On” Hit “Enter”

Setting Zoom (TI-84+) 1) Hit the zoom button and select choice 9 “ZoomStat”

Creating Scatter Plots (TI-84+)
Hit the “stat” button 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+)
Hit the “Stat” button Hit the right arrow once to select “Calc” Select choice 4: ‘LinReg(ax +b)’ Hit “Enter” 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: Hit “Y=” 2) Hit “VARS” Select choice 5: “Statistics” 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 