The Difference of 2 Poissons

• When means are equal (e.g., blanks), are symmetric

• Discrete, not continuous
  • For mb = 3, P(Nɘ) = 0.42, P(Nɘ) = 0.58
  • For Normal, P(Nɘ) = 0.500, P(Nɘ) = 0.500

• Probabilities on upper tails aren’t too much different from Normal

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