Fit a straight line to the given points (x, y) by least squares. Show the details. Check

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Fit a straight line to the given points (x, y) by least squares. Show the details. Check your result by sketching the points and the line. Judge the goodness of fit.

Estimate the spring modulus k from the force F [lb] and the elongation s [cm], where (F, s) = (1, 0.3), (2, 0.7), (4, 1.3), (6, 1.9), (10, 3.2), (20, 6.3).

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