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Unformatted text preview: Proportions A proportion is the fraction of individuals having a particular attribute. Example: 2092 adult passengers on the Titanic; 654 survived Proportion of survivors = 654/2092 ! 0.3 Probability that two out of three randomly chosen passengers survived the Titanic Binomial distribution The binomial distribution describes the probability of a given number of " successes " from a fixed number of independent trials. n trials; p probability of success Pr[ X ] = n X ! # % & p X 1 p ( ) n X n X ! # % & = n ! X ! n X ( ) ! 6! = 6 5 4 3 2 1 = 720 0!=1 1!=1 n! = n n1 n2 ... 3 2 1 ! Probability that two out of three randomly chosen passengers survived the Titanic Pr[2] = 3 2 ! # % & 0.3 ( ) 2 1 0.3 ( ) 3 2 = 3! 2! ( 1! 0.3 ( ) 2 0.7 ( ) 1 = 3 0.3 ( ) 2 0.7 ( ) = 0.189 Probability that two out of three randomly chosen passengers survived the Titanic Pr[2] = 3 2 ! # % & 0.3 ( ) 2 1 0.3 ( ) 3 2 Number of ways to get 2 survivors out of 3 passengers ! Probability of 2 survivors ! Probability of 1 death ! Example: Paradise flycatchers A population of paradise Fycatchers has 80% brown males and 20% white. Your eld assistant captures 5 male Fycatchers at random....
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This note was uploaded on 04/16/2010 for the course MATHEMATIC 1231 taught by Professor Driscoll during the Spring '10 term at Clayton College of Natural Health.
 Spring '10
 Driscoll
 Statistics, Probability

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