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Singh et al (20009) introduced a family of exponential ratio and product typeestimators in stratified random sampling. Under stratified random samplingwithout replacement scheme, the expressions of bias and mean square error (MSE)of Singh et al (2009) and some other estimators, up to the first- andsecond-order approximations are derived. Also, the theoretical findings aresupported by a numerical example.

Exponential ratio-product type estimators under second order approximation in stratified random sampling