<p>It’s not at all clear that you understand the meaning of the word “fact”.</p>
<p>In any case, here’s another study that includes surveys of students with single and double majors:</p>
<p><a href=“http://www.vanderbilt.edu/curbcenter/cms-wp/wp-content/uploads/Teagle_Report_Final_3-11-13.pdf”>http://www.vanderbilt.edu/curbcenter/cms-wp/wp-content/uploads/Teagle_Report_Final_3-11-13.pdf</a></p>
<p>A quote from the findings: “Double majors generally have higher GPA’s than single majors.”</p>