Abstract
In many environmental applications, such as risk and exposure assessment associated with hazardous waste sites, one is interested in a parameter which can be described as the product of means of several independently distributed gamma variables. In this paper an optimal method of constructing a confidence interval for this parameter is developed. Explicit formulae are given in the case of two independent variables, a situation quite eommon in applications. The proposed prodedure provides a substantial improvement over the commonly used technique of combining individual intervals constructed separately for each mean.
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