They are all the possible results of n experiment or statistical observation: A) Sample Space B) Complement C) Joint Event D) Single Event 4. Probability is based on observed data and not prior knowledge of a process: A) "a priori" B) Empirical C) Subjective D) Conditional 5. When two events are mutually exclusive it is said that: A) It is the inverse of the other B) They cannot occur at the same time C) One occurs before the other D) One of them must occur