Question: 21.41 Write a user-defined function [, 21 al, ao]-CubicRegression (x, y) that uses the cubic least-squares regression approach to find the third-degree polynomial that be

21.41 Write a user-defined function [, 21 al, ao]-CubicRegression (x, y)

21.41 Write a user-defined function [, 21 al, ao]-CubicRegression (x, y) that uses the cubic least-squares regression approach to find the third-degree polynomial that be expressing the appropriate 4x 4 system of equations in matrix form and solving by "\" in MATLAB. The function also should return the plot of the data and the best cubic polynomial fit. st fits a set of data. The coefficients , au al, ao are found by

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