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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 S’s • 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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 Spring '07
 Roberts
 Probability theory, $1, #, $0

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