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Unformatted text preview: Random variable follows a binomial distrib if 1. Perform n identical trials 2. Only two possible outcomes (S,F) 3. P(S) is constant on each trial 4. Trials are independent 5. Random variable of interest is number of successes (S) on the n trials Binomial Calculations Binomial formula for n trials, P(S)=p, and X is the random variable for number of Ss P(X=x) = Where X= 0,1,2,3,,n Table for Cumulative Binomial Table II, textbook p.875878 For certain values of n and p, table gives the P(X less than or equal to x) Example: n=6, p=.7 then P(X 4) =0.580 What is P(X=4)? Practice Problem Chapter 4 # 44, p. 216...
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This note was uploaded on 03/16/2009 for the course ECN 221 taught by Professor Roberts during the Spring '07 term at ASU.
 Spring '07
 Roberts

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