If I recall correctly, the equation for $R^2$ is $\frac{SST-SSE}{SST}$
So is the answer simply, $\frac{60-40}{60}=\frac{1}{3}$?
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$\begingroup$ Refer to the book of Douglas C. Montgomery on Introduction to Linear Regression Analysis. $\endgroup$– user5430917Oct 11, 2015 at 6:04
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2 Answers
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The regression model fitted is a polynomial regression model, so you may better search for Polynomial Regression model in the book of Douglas C. Montgomery on "Introduction to Linear Regression Analysis".
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Please, you must review the definition of R - squared Find here the right answer.
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$\begingroup$ Thank you so much! I'll study this and ask if I'm lost :D $\endgroup$ Oct 11, 2015 at 16:03