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Abstract
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In situations where the sampling units in a study can be more easily ranked based on the measurement of an auxiliary variable, ranked set sampling provides unbiased estimators for the mean of a population that are more efficient than unbiased estimators based on simple random
sampling. In this paper, we consider the Morgenstern type bivariate generalized exponential
distribution and obtain several unbiased estimators for the mean parameter of its marginal
distribution, based on different ranked set sampling schemes. The efficiency of all considered
estimators are evaluated and several numerical illustrations are given.
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