This tutorial provides a step-by-step example of how to create a residual plot for the following dataset on a TI-84 calculator:
Step 1: Enter the Data
First, we will enter the data values.
Press , then press . Then enter the x-values of the dataset in column L1 and the y-values in column L2:
Step 2: Perform Linear Regression
Next, we will fit a linear regression model to the dataset.
Press , then scroll over to . Then scroll down to LinReg(ax+b) and press .
Press once again to perform linear regression:
The fitted regression model is: y = 7.397 + 1.389x
Step 3: Create the Residual Plot
Next, press and then press . In the new screen that appears, press on the first plot option.
Hover over the “On” option and press press . Then scroll down to YList and press and then press . Then press “7” to choose the residuals:
The term “RESID” will then appear next to Ylist:
Lastly, press and then scroll down to ZoomStat and press .
The residual plot will appear:
The x-axis displays the x values from the dataset and the y-axis displays the residuals from the regression model.
To see the actual values of the residuals, press and then press . Then press “7” to choose the residuals:
Press once more to display the residuals.
Scroll to the right to see the values for each of the residuals.