9.39 Let Y₁, Y₂,..., Y, denote a random sample from a Poisson distribution with parameter λ. Show by conditioning that Y; is sufficient for >.

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**Exercise 9.39**

Let \( Y_1, Y_2, \ldots, Y_n \) denote a random sample from a Poisson distribution with parameter \( \lambda \). Show by conditioning that \( \sum_{i=1}^{n} Y_i \) is sufficient for \( \lambda \).
Transcribed Image Text:**Exercise 9.39** Let \( Y_1, Y_2, \ldots, Y_n \) denote a random sample from a Poisson distribution with parameter \( \lambda \). Show by conditioning that \( \sum_{i=1}^{n} Y_i \) is sufficient for \( \lambda \).
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