Problem 6 (20 points) The following measurements were made in an experiment 4 6 3 6 7 4 9 10 12 12 20 30 a) Use your functions myLinReg, myExpoFit, and myCubicFit to determine the linear best fit, exponential best fit, and cubic best fit to the measured data. b) In a single plot, plot the measurement data as symbols, and the three fitted curves to the data. Clearly label your plot. c) Estimate the value of y at r 11 using the three fits. function [a0_a1_EmyLinReg(x,y) [a]-polyfit(x,y,1); % residual finding ry-polyval (a,x); %%Error i.e sum of square of residual E = sum ( r^2 ) ; end function [a,e) = myCubicFit (X,Y) susing least square X modify in the form of X3+X2+X1- y form [x.^3, , mod = AeX-mod'*x-mod; x.^2 , x,ones ( size (X))); | %Amatrix a=u' ; E X-mod*u-Y ; %error end P function [b,m]myExpoFit(x,y) | output = myLinReg ( x, log(y)); Retrieving b and m from ouput l 109-b = output (2); exp( Log_b) s- m-output (1); 1end 13