I need MATLAB Code as well please, Thanks!

1. (15 points): MATLAB code submission is required Given the measured data set: (1a) Use the least squares regression to find the 3rd - order polynomial that best fits the data. This includes: detailed formulation of the problem leading to the system of linear algebraic eqns. for the free parameters and the solution of the free parameters using MATLAB (8 points); (1b) Plot the data and the polynomial on the same plot (must be computer generated) (4 points); (1c) Calculate the sum of error square Er ( 3 points)