A line of best fit is the line that best “fits” the trend of a dataset.
This tutorial provides a step-by-step example of how to calculate the line of best fit 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: Find the Line of Best Fit
Next, we will find the line of best fit.
Press , then scroll over to . Then scroll down to and press .
Then press and and comma then press and and comma then press and scroll over to to and press .
Your screen should look like this:
Press once more and the following line of best fit will be displayed:
The line of best fit is: y = 5.493 + 1.14x
Step 3: Plot the Line of Best Fit
Lastly, we will plot the line of best fit.
Press and then scroll down to and press .
The following scatterplot with the line of best fit will be shown: