what is a preliminary regression analysis?

Missed a few lessons at Uni and now I have the essay and
to be honest, I'm clueless.

Just found a few videos on the ol youtube for Regression Analysis,
yet I'm wondering if the preliminary is something different entirely.
Guessing it's not at deep and maybe preparation in one way or another
for something bigger?

Any help would be appreciated, thank you people.
 
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