The sad thing is there are already many well-researched strategies for improving the success of all students in calculus and significantly reducing any gaps between student groups. Things like: * Teaching the math in context instead of abstractly. See https://engineering-computer-science.wright.edu/research/eng... * Give students opportunities to learn from one another in groups, using techniques like peer instructio…
The study showed that the problem is not in performance, but in confidence levels. So the strategies that you mentioned won't solve the problem.
The first link (teaching math in the context of engineering) increases the confidence of female students (along with many other benefits): https://www.aacu.org/sites/default/files/files/tides/Klingbe...
Peer instruction narrows the gender gap http://mazur.harvard.edu/research/detailspage.php?rowid=9
Inquiry based learning in math helps female students http://www.colorado.edu/eer/research/steminquiry.html
and so on
confidence (and related concepts like self-efficacy and sense of belonging) can be taught directly or positively influenced indirectly. See for example interventions that teach 'growth mindset' in math: http://www.aauw.org/2011/05/26/growth-mindsets-and-stem/
This video explains growth mindset the best: https://www.youtube.com/watch?v=pN34FNbOKXc
And Jo Boaler has written a great deal on how growth mindset can improve girls' performance in math classes: http://wordplay.blogs.nytimes.com/2016/04/18/boaler-math-min...