Faculty members in statistics and biostatistics departments often have specialized research/application areas. This can make the SOP difficult, since expressing very specific interests limits the odds of admission, while failing to describe coherent/cohesive interests is perhaps a red flag.
I'm very interested in attending University X (who I haven't yet heard back from). I suspect that my narrow SOP negatively affected my chances of admission (only a small number of faculty are in the particular research/application area "Z"). Can anything be done at this point in the application process (e.g., contacting an admissions officer) given that I am more interested in attending University X than in studying research/application area "Z" elsewhere?