• 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.

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.

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