Answer: In Example 6.8, we introduced the concept of a
Chapter 7, Problem 7.57(choose chapter or problem)
In Example 6.8, we introduced the concept of a censored experiment in which n components are put on test and the experiment terminates as soon as r of the components have failed. Suppose component lifetimes are independent, each having an exponential distribution with parameter . Let Y1 denote the time at which the first failure occurs, Y2 the time at which the second failure occurs, and so on, so that Tr Y1 Yr (n r)Yr is the total accumulated lifetime at termination. Then it can be shown that 2Tr has a chi-squared distribution with 2r df. Use this fact to develop a 100(1 )% CI formula for true average lifetime 1/. Compute a 95% CI from the data in Example 6.8. 58
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