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Section 4.3
Addition Rule
Term | Definition |
---|---|
Addition Rule | device for finding probabilities that can be expressed as P{A or B), the probability that either event a occurs or event B occurs (or they both occur) as the single outcome of the procedure; keyword = "or" inclusive or (either one or the other or both) |
Compound Event | any event combining 2 or more simple events; NOTATION P(Aor B) = P (in a single trial, event A occurs or event B occurs or they both occur) "find the total in such a way that no outcome is counted more than once" |
Formal Addition Rule | P(A or B) = P(A) + P(B) - P(A and B); where P(A and B) denotes the probability that A and B both occur at the same time as an outcome in a trial of a procedure |
Disjoint or Mutually Exclusive | Events A and B are disjoint if they cannot occur at the same time. (disjoint events do not overlap) |
Complementary Events | P(A) & P(A-) are disjoint; Rule; P(A)+P(A-)=1 P(A-)+1-P(A); P(A)=1-P(A-) |