I guess that depends on what you mean by observant.What really makes a man observant?Is it rituals ,chanting,robes and the other trappings or is it something inside that takes your faith and makes it the guiding star of your existence?I would say that true observance comes from a faith that transforms every aspect of your life.Such a faith will not be evident by appearances - but by how a person lives.How can statisticians ever quantify that?Good luck!