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# tutorial03w - ISMT 111 BUSINESS STATISTICS TUTORIAL 3 Two...

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1 ISMT 111 B USINESS S TATISTICS T UTORIAL 3 created by Andrew Yam Two Independent Variables Let X and Y be two independent discrete random variables, while a is a constant. ( 29 ( 29 X aE aX E = ( 29 ( 29 ( 29 Y E X E Y X E ± = ± ( 29 ( 29 X Var a aX Var 2 = ( 29 ) ( ) ( Y Var X Var Y X Var + = ± Combinations The number of combinations of selecting x objects out of n objects is given by ! )! ( ! x x n n C n x - = where n != n ( n - 1)( n - 2) 1 is called n factorial . [Note: 0! is defined as 1.] Binomial Distribution § Properties of a binomial experiment 1. Two possible outcomes in each trial. For example, - good & defective, - - 2. The experiment contains n trials and - every trial is identical - these n trials are from:

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## This note was uploaded on 09/15/2008 for the course ISMT 111 taught by Professor Wanxuhu during the Fall '08 term at HKUST.

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tutorial03w - ISMT 111 BUSINESS STATISTICS TUTORIAL 3 Two...

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