Solving Poisson Distribution Homework: Find f(y)

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SUMMARY

The discussion focuses on solving a Poisson distribution homework problem involving the calculation of the density function f(y) for the time until the second event in a Poisson process with intensity λ. The key insight is that the holding times, represented by X1 and X2, are independent and follow an exponential distribution with parameter λ. The probability of no events occurring in time y is expressed as p(0; λX1) = e^{-λt}, which is crucial for deriving the density function.

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  • Understanding of Poisson processes and their properties
  • Knowledge of exponential distributions and their parameters
  • Familiarity with probability density functions
  • Basic calculus for manipulating density functions
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  • Learn how to calculate joint distributions for independent random variables
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  • Review the concept of memorylessness in exponential distributions
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Students studying probability theory, statisticians, and anyone working on problems related to Poisson processes and exponential distributions.

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Homework Statement



In a Poisson process with intensity λ, let X1 be the time until the first event and let X2 be the time between the first and the second event. Let Y be the time until the second event, that is, Y = X1 + X2. Find the density function f(y).

2. The attempt at a solution

Probability that no events occur in time y:

[tex] p(0; \lambda X1) = e^{- \lambda t}[/tex]

I don't know if this will be helpful at all...
 
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I'll give you a hint, the holding times (time between two jumps) of a Poisson process are independent and exponential with parameter lambda. You may want to prove this.
 

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