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I'am working on a project where I need to calculate the best-fit; linear, quadratic, and exponential...

I'am working on a project where I need to calculate the best-fit; linear, quadratic, and exponential models along with their respective R2 value.
My best fit was the quadratic model.
The question is:
"Comment as to why it is important to choose a model that very accurately represents your data, while throwing away the other models."

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