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Statistical VarianceMaximum Likelihood EstimationBalanced Incomplete BlockIncomplete Block DesignsFinite PopulationPopulation MeanExponential DistributionRandom VariablesMaximum LikelihoodDesign EfficiencySample SizeLorenz CurveOrder StatisticsGamma DistributionBlock DesignSeries DistributionUniformly Minimum Variance Unbiased EstimatorLeast SquaresPBIB DesignsUnbiased Estimation