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