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An infinite set of points can be a microscopically small line segment. An infinite number of points does not mean an infinitely long line.
it is called best fit because it minimizes the sum of square of the distances of points from line. That is to say, if you add up the squares of the distance of the different data points from the line, it will have the smallest value and it is in our interest to have the distance of the point from the line be as small as possible given by ziar khan
Points have no dimensions - no length, breadth or height. At 0.5 mm they are no longer a point but a blob (or a very small disk).
Errors or inaccuracies.
greater than > less than < The small end points to the smaller value.