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If you have a set...

If you have a set of (x,y) pairs that you collect from observation (ex. no of years performing a certain job versus salary paid to an employee), then after you plot these (x.y) pairs , you want to create a straight line that most closely goes by those (x,y) pairs in such a way that the sum of the squared distances from each (x,y) point to the line ,measured vertically, is the smallest possible. Does this make sense. Please tell me

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