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Unformatted text preview: Exam 2 Cheat Sheet Kimberly Glennon-OR use addition; AND use multiplication.- Disjoint events: events that share no simple outcomes in common. A and B are disjoint if they both can’t happen at the same time. No overlap. P(A and B) = 0.- Independent events: two events are independent if the chance that one of the events occurs is unaffected by the occurrence of the other event. Basic Probability Rules-Rule 1: for any event A, P(A) is between 0 and 1.-Rule 2: the sum of the probabilities of all possible outcomes is 1.-Rule 3: the Complement Rule . The probability that an event does not occur is 1 minus the prob that it does occur. P(A) = 1-P(not A). Use in AT LEAST 1 situations, use ands/multiplication in not A part.-Rule 4: the Addition Rule for Disjoint Events is P(A or B)=P(A)+P(B) the General Addition Rule (for NOT Disjoint Events) is P(A or B)=P(A)+P(B) – P(A and B)-Rule 5: the Multiplication Rule for Independent Events. P(A and B)=P(A)*P(B) the General Multiplication Rule. P(A and B) = P(A)*P(B given A). useful when events occur in stages, first P(A and B) = P(A)*P(B given A)....
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This note was uploaded on 01/23/2012 for the course STA 261 taught by Professor Beal during the Fall '08 term at Miami University.
- Fall '08