Statistics: What is the difference between a Binomial and Poisson distribution?
Binomial:
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A single trial has only 2 possible outcomes: success or failure
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A fixed number of trials, n
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Trials are independent
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The probability of success remains constant at each trial
Mean: E(x) = np Var(x) = np(1-p)
Poisson:
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events must occur singly - 2 cannot occur simultaneously
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uniformly - events occur at a constant rate
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independently - occurence of one event does not influence another
mean = variance
SS
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