In other words, “high crime” and “low crime” do not have the mathematical relationship of A and ~A. Their probabilities do not sum to 1. There is also a third contrasting option, “normal crime”, which is where the “evidence for no mafia” goes.
In other words, “high crime” and “low crime” do not have the mathematical relationship of A and ~A. Their probabilities do not sum to 1. There is also a third contrasting option, “normal crime”, which is where the “evidence for no mafia” goes.