[issue44151] Improve parameter names and return value ordering for linear_regression

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

> The named tuple should be called Line because that is what it describes.  Also, a Line class would be reusuable for other purposes that linear regression.

I think that most people would expect that a Line class would represent a straight line widget in a GUI, not the coefficients of a linear equation.

The result tuple represents an equation (or at least the coefficients of such), not the line itself. If it doesn't have a .draw() method, I don't think we should call it "Line".

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<https://bugs.python.org/issue44151>
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