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Unformatted text preview: University of California, Los Angeles Department of Statistics Statistics 100A Instructor: Nicolas Christou Homework 5 EXERCISES 1 Find the distribution of the random variable X for each of the following momentgenerating func tions: a. M X ( t ) = h 1 3 e t + 2 3 i 5 . b. M X ( t ) = e t 2 e t . c. M X ( t ) = e 2( e t 1) . EXERCISES 2 Let M X ( t ) = 1 6 e t + 2 6 e 2 t + 3 6 e 3 t be the momentgenerating function of a random variable X . a. Find E ( X ). b. Find var ( X ). c. Find the distribution of X . EXERCISES 3 Let X follow the Poisson probability distribution with parameter . Its momentgenerating function is M X ( t ) = e ( e t 1) . a. Show that the momentgenerating function of Z = X is given by: M Z ( t ) = e t e ( e t  1) . b. Use the series expansion of e t = 1 + t 1! + ( t ) 2 2! + ( t ) 3 3! + to show that lim M Z ( t ) = e 1 2 t 2 ....
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 Fall '07
 Wu
 Statistics

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