Unit 4 - Lesson 2
Line of Best Fit (Using the Calculator)
Line of Best Fit
- A line of best fit is a straight line that comes closest to the points on a scatter plot.
- It is also called a linear model.

How to Create Line of Best Fit
Step 1: Clear old data
Press STAT & ENTER. Then move cursor onto L1, and press CLEAR &
ENTER. Then move cursor onto L2, and press CLEAR & ENTER.
Step 2: Enter new data
Enter x-values under L1 & y-values under L2.
Step 3: Calculate the line of best fit
Press STAT & the RIGHT ARROW. Then press 4 & ENTER.Lets Look at an example!!

Let's Make a Prediction!
Predict the weight of a man with a size 13!
Y = 4.09x + 44.46
y = 4.09(13) + 44.46
y = 97.6 Kg
Y = 4.09x + 44.46
y = 4.09(13) + 44.46
y = 97.6 Kg