/sci/ - Science & Math

Hey guys I just started in my stats class today and this question came up, it seems to vague to answer, can it be answered?

Determine whether the study depicts an observational study or an experiment. A study is conducted to determine if there is a relation between heart arrhythmias and caffeine consumption. is the study an observational study or an experiment?
a) Observational study b) Experiment

Doing a (pure) regression analysis course.

Already did my econometrics so I know what it's about, but what kind of pre-req material from mathematical statistics is most important?

I'm going to be honest, I did it in summer school a couple years ago and I was kind of shitty at deriving probability distributions and shit like that.... (chapter 8-10 out of wackerly's book is where I started to not give a fuck)

using montgomery's intro to regression modelling book....