Write a MATLAB program to fine the line of best fit. Your program consists of

$($a$)$ A mainLS.m to run the program.

$($b$)$ A LS$.$m to find the the line of best fit. In this function, the input parameters include the data points $($xp$,$ yp$),$ and n the power of the line of best fit.

$($c$)$ The outputs printouts consist of the coefficient an of the polynomial.

$($d$)$ A stdDev.m to compute the $\backslash$sigma and r$2.$ The input of this function is the coefficient an and $($xp$,$ yp$)$

e$)$ Plot the first $3$ polynomials in the same plot together with your data set. Title and labels are required.