Hard science classes definitely more appropriate for those looking to do more bio/med/neuro type research. I think most neuro students (and many practicing clinicians) are very weak in neuroanatomy and neurophysiology....a pet peeve of mine. I think upper-level stats classes can help a bit more across the board. Stats are stats...whether you use them for biz, science, or the stock market. Once you start noticing nuanced differences in what works best in each area, you'll be 3-5 stats classes in and NerdBait to most labs. 😉 However, a dark-horse option would be to consider programming classes that look at database development/architecture. If you know how to work with large data sets, write code to query various types of databases, and understand HOW and WHAT is being done...then you can get a leg up on most applicants in certain types of labs. Be warned, the good classes require a solid understand of logic, basic coding strategies, and they will eat up anyone who doesn't have prior programming experience/exposure. Upper-level stats classes can have some crossover into this kind of learning.