two stage cluster sampletwo stage designtwo stage experimenttwo stage sampletwo stage samplingtwo tail testtwo tailedtwo tailed testtwo theoremtwo thingstwo valuedtwo valued functiontwo valued variabletwo variate distribution lawtwo waytwo way analysis of variancetwo way clamptwo way classificationtwofoldtychonoff topologytychonov spacetychonov theoremtypetype castingtype i errortype i error probabilitytype ii errortype ii error probabilitytype problemtype theorytypicaltypical valuestypicallyuu curveu flowu testufdultimateultimate administrative authorityultimate authorityultimate clusterultimate departmentationultimate maximizerultimate responsibilityultimate sampling unitultimatelyultraultra idealultra parallel