Understanding where they got the parameters from

by Killercamin   Last Updated November 17, 2017 17:19 PM

I was looking at this example: https://onlinecourses.science.psu.edu/stat500/node/59

and I got to the point where they use $\beta_0=-222$ My question is where did they get those parameters, since they state the $\beta_0$ is when $X=0$ but since it is not in the scope of the scatter plot then they just mention that "it is not much of interest," does that mean that we can pick another value for our constant term?

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