twitter: @farrarscott web: www.scottfarrar.com 1. Drag points P_1 and P_2 to try to find a line of best fit. 2. Check "[color=#0a971e]Show Squared Residuals[/color]" to reveal extra information. 3. Check "[color=#555]Show Line of Least Squares[/color]" to see the answer. 4. Check "[color=#c51414]Show Squared y deviations[/color]" to observe a piece of how R^2 is calculated. 5. data points [color=#1551b5]A, B, C, D, E[/color] can be dragged as well to observe other cases.