1. Press the "Stat" button. 2. Use the cursor to highlight "1: Edit" and press "Enter. 3. Enter the data for your scatter plot. Put the xvalues in column
http://www.ehow.com/how_8622809_plotlinefitgrap...

A line of best fit is a straight line that best represents the data.
http://www.chacha.com/question/whatisabestfitt...

Least squares regression is one of several statistical techniques that could be applied.
http://wiki.answers.com/Q/What_should_you_use_to_f...

Actually the eyes of a human are a fantastic tool! Seriously. Looking at a group of points ( a scatter plot) on a piece of paper with the ability to find a straight line that fits
http://answers.yahoo.com/question/index?qid=201111...
