By using a straight line to join the points in plot, The residuals would tend to be one-sided.
What is a straight line?
"A line is simply an object in geometry that is characterized under zero width object that extends on both sides. A straight line is just a line with no curves. So, a line that extends to both sides till infinity and has no curves is called a straight line."
What is a plot?
"A plot is a graphical technique for representing a data set, usually as a graph showing the relationship between two or more variables."
By joining (0, 250) and (4, 25) by a straight line puts three other points below it in the plot.
So, the residuals would tend to be one-sided.
Learn more about straight line and plot here
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