A type of network router has a bandwidth total to first hardware failure called S expressed in terabytes. The random variable S is modelled by an exponential distribution whose density is given by: s(t) with a single parameter 0. Consider the bandwidth total to failure T of the sequence of the two routers of the same type (one being brought up automatically when the first is broken). Express T in terms of the bandwidth total to failure of single routers S, and S2. Formulate realistic assumptions about these random variables. Calculate the density function of the variable T.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
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A type of network router has a bandwidth total to first hardware failure called S expressed in terabytes. The random variable
S is modelled by an exponential distribution whose density is given by:
s(t)
with a single parameter 0. Consider the bandwidth total to failure T of the sequence of the two routers of the same type
(one being brought up automatically when the first is broken).
Express T in terms of the bandwidth total to failure of single routers S, and S2. Formulate realistic assumptions about these
random variables. Calculate the density function of the variable T.
Given an experiment with the dual-router-system yielding a sample T,, T2, -, Tn, calculate the likelihood function for 0.
Propose a transformation of this likelihood function whose maximum is the same and can be computed easily.
An actual experiment is performed, the infrastructure team has obtained the following bandwidth total to failures:
9.2, 5.6, 18.4, 12.1, 10.7
Estimate the model-parameter with the maximum likelihood and compute the expectation of the bandwidth total to failure
of the dual-router-system.
Transcribed Image Text:A type of network router has a bandwidth total to first hardware failure called S expressed in terabytes. The random variable S is modelled by an exponential distribution whose density is given by: s(t) with a single parameter 0. Consider the bandwidth total to failure T of the sequence of the two routers of the same type (one being brought up automatically when the first is broken). Express T in terms of the bandwidth total to failure of single routers S, and S2. Formulate realistic assumptions about these random variables. Calculate the density function of the variable T. Given an experiment with the dual-router-system yielding a sample T,, T2, -, Tn, calculate the likelihood function for 0. Propose a transformation of this likelihood function whose maximum is the same and can be computed easily. An actual experiment is performed, the infrastructure team has obtained the following bandwidth total to failures: 9.2, 5.6, 18.4, 12.1, 10.7 Estimate the model-parameter with the maximum likelihood and compute the expectation of the bandwidth total to failure of the dual-router-system.
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