Transcription of Probability Cheatsheet v2.0 Thinking Conditionally Law of ...
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Probability Cheatsheet by William Chen ( ) and Joe Blitzstein,with contributions from Sebastian Chiu, Yuan Jiang, Yuqi Hou, andJessy Hwang. Material based on Joe Blitzstein s (@stat110) lectures( ) and Blitzstein/Hwang s Introduction toProbability textbook ( ). LicensedunderCC BY-NC-SA Please share comments, suggestions, and Updated September 4, 2015 CountingMultiplication RulecakewaffleSVCSVCSVC cakewafflecakewafflecakewaffleLet s say we have a compound experiment (an experiment withmultiple components). If the 1st component hasn1possible outcomes,the 2nd component hasn2possible outcomes, .. , and therthcomponent hasnrpossible outcomes, then overall there for the whole Table765842931 The sampling table gives the number of possible samples of sizekoutof a population of sizen, under various assumptions about how thesample is MattersNot MatterWith Replacementnk(n+k 1k)Without Replacementn!
Joint Probability P(A\B) or P(A;B) { Probability of Aand B. Marginal (Unconditional) Probability P( A) { Probability of . Conditional Probability P (Aj B) = A;B)=P ) { Probability of A, given that Boccurred. Conditional Probability is Probability P(AjB) is a probability function for any xed B. Any theorem that holds for probability also
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