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Question about regression.

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Hey, I'm working on an IB Maths SL task and I wanted to know something. I have data points from which I generated a quadratic and a cubic function (by means of simultaneous equations). However, none of these functions fit the data points perfectly. How can I see which of the two functions fits the points better? Thanks for everything!

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Find the r[sup]2[/sup] values for the regressions. The eqn with a value closer to 1 is the better fit.

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