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Unformatted text preview: E ( X ) ± E ( Y ), V ar ( X ± Y ) = V ar ( X ) + V ar ( Y ) if independent Geometric Model Model for: X = number of trials until the ﬁrst success Distribution: P ( X = x ) = q x1 p , x = 1 , 2 ,... Mean: μ = 1 p Standard Deviation: σ = r q p 2 Binomial Model Model for: X = number of successes in n Bernoulli trials Distribution: P ( X = x ) = n C x p x q nx , x = 0 , 1 ,...,n Mean: μ = np Standard Deviation: σ = √ npq 2...
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This note was uploaded on 07/25/2008 for the course STT 200 taught by Professor Dikong during the Summer '08 term at Michigan State University.
 Summer '08
 dikong

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