LEZIONI DI STATISTICA MEDICA ! " ! " # # $ % '( & ! )*+ , ! ! ! "! - . '( - / 0 0 $ , 0 . 1. 2.3 4!51! # $ # # $ $ %& 6 & ' -. 1. 1 ." 72.3 5" 1. &( ) !7 !1! & - 8 . '( , / $ 8 (4x3x2)/2= (4x3x2)/2*(4-2) =24/4=6 # $ * # $ Cn , k n k = n n! = = k k !(n − k )! n n−k ) / , C n,k 5 5! 5 x 4 x3 x 2 x1 = = = = 10 3 3!(5 − 3)! (3 x 2 x1) x(2 x1) 0 ! 9 * ) / $ : 0 6 !* 8 ( 9 ( ) 5 5! 3 10 P ( A ∩ A ∩ A) = = 3!2! = = 0.009 20! 1140 20 3!17! 3 * 2 ! ! 51 2 5 15 P ( A) = 1 2 20 3 51 2 54 2 54 2 5! 15! 105 x5 = 3!2! 2!13! = = 0.46 20! 1140 3!17! 5 5 15 2 1 P ( AA) = 20 3 5! 15! 10 x15 = 3!2! 1!13! = = 0.13 20! 1140 3!17! " 15 15! 3 455 P (nessunA) = = 3!12! = = 0.40 20! 1140 20 3!17! 3