There's too many distractions and I cannot keep them away because it's all in my mind. I'm bugging myself and I just get more and more confused. I cannot get myself to settle down and study properly, or do anything properly. And I totally cannot get over the fact that I cannot understand statistics. Grr....

What the hell is degreeoffreedomztestttestchisquarevariancestandarddeviationsamplemeanpopulationmeananova!

。尋找中@23:12