Find the least squares polynomials of degree 1 for the data in the following table. Compute the error E. Use MATLAB.  (Submitted in Assignment 8).  Do not submit again. Only show values of Pxi.

xi   1.0     1.1     1.3     1.5     1.9     2.1
yi   1.84   1.96   2.21   2.45   2.94   3.18

What did you notice when you compare the two graphs (xi, yi )and (xi, Pxi)? why?