lecture5 - LECTURE V STAT 515 January 28, 2010 USC-Columbia...

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Unformatted text preview: LECTURE V STAT 515 January 28, 2010 USC-Columbia Lecture 5 p.1 Exercise 2 Suppose a poll of 20 voters is taken in a large city. The purpose is to determine X , the number who favor a certain candidate for mayor. Suppose that 60% of all the citys voters favor the candidate. a . Find the mean and standard deviation of X . b . Use the binomial probability tables to find the probability that X 10 . c . Use the table to find the probability that X > 12 . Lecture 5 p.2 What is a Poisson variable(optional)? Poisson (1781-1840) is a French mathematician. Poisson variable is a random variable, like Binomial, only assume discrete values, , 1 , 2 ,... . It is very natural to use it to count events. For example, the number of unscheduled admission per day to a hospital, or the number of death claims received per day by an insurance company. What is the likelihood of having three unscheduled admissions to Lexington hospital for tomorrow? what about 6,10,29 admission? Should these probabilities be increasing, or decreasing?...
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This note was uploaded on 06/06/2011 for the course STAT 515 taught by Professor Zhao during the Spring '10 term at South Carolina.

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lecture5 - LECTURE V STAT 515 January 28, 2010 USC-Columbia...

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