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Statistical VarianceIncomplete Block DesignsDegrees of FreedomRandom SamplingAnalysis of VarianceNational Sample SurveyPopulation MeanStatistical AnalysisBalanced Incomplete BlockSine FunctionStandard DeviationMathematical ConstantsEstimation MethodsResearch MethodologyFactorial DesignDemographic FactorsLinear TransformationsPopulation DynamicsFrequency DistributionStatistical Publications