Yeah. This is a big problem, because your average psychology student is a very particular kind of person - young, middle class woman that is bad at maths and simply wants to get <i>a</i> degree from something.<p>Before I get called out as -ist, let me explain. Psychology is one of the few &quot;default&quot; subjects - i.e. something you pick when you don&#x27;t know what do you want to major in. It&#x27;s also a stereotypical feminine subject, hence huge gender gap. The other popular &quot;default&quot; choice is economics, which tend to draw those proficient at maths.<p>The point being, psychology students are a <i>very particular</i> subset of the population, and thus it&#x27;s difficult to generalize results from them to everyone.