His ares of interest include Survey Sampling, Mathematical Statistics and Statistical Models. Muhammad Hanif is Professor in Mathematics Department, LUMS, Lahore. His field of interest is Survey Sampling.Muhammad Qaiser Shahbaz is an Associate Professor of Statistics at Department of Mathematics, COMSATS Institute of IT, Lahore, Pakistan. His ares of interest include Survey Sampling, Mathematical Statistics and Statistical Models. Muhammad Hanif is Professor in Mathematics Department, LUMS, Lahore. His field of interest is Survey Sampling.