Question: Exercise 1.13.1, useCp to determine a best submodel for each fit. Plot the regression lines for the best submodels. Which family works better on these

Exercise 1.13.1, useCp to determine a best submodel for each fit. Plot the regression lines for the best submodels. Which family works better on these data, cosines or polynomials? Use Cp to determine the highest frequency needed when fitting sines and cosines.

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