The Line of Best Fit

Line of best fit has 2 characteristics:

(i) it passes through as many points as possible,
(ii) the number of points which are not on the line of best fit are equally distributed on the both sides of the line.

Example

Check whether the following graph has the characteristic of the line of best fit

(a)

Yes! This is the Line of Best Fit. Notice that you have 3 points passes through the straight line,1 points above the line and 1 point below the line. The number of points which are not on the line of best fit are equally distributed on the both sides of the line.

(b)

No. This is NOT the Line of Best Fit. Notice you have more points above the line than below the line. The number of points which are not on the line of best fit are NOT equally distributed on the both sides of the