So i have due for my linear algebra class my last matlab project which reads exactly this from the website:

"Second Computational Project, due by the final or sooner. At a mimimum, compare a least squares fit using the average vs. a least squares fit using a linear model."Given this data: http://www.math.ufl.edu/~olson/popclockest.txt

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It seems simple enough, and I did this:

What is the difference between the "least squares fit using theaverage" and the "least squares fit using alinear model" and which ones the one i did already, thanks!