Application of FCI at engineering students in Bogota: an interpretation   of the answers through a random model of two levels
  We applied the FCI to 646 engineering students from Bogota when they began your first year physics, we found that the relative frequency of the number of correct answers has a random pattern of two levels, also we found that they don't have clear mental models about physical world. 
Paco Talero, Orlando Organista, Luis Barbosa
physics.ed-ph