Osuji George A.
Department of Statistics, Nnamdi Azikiwe University, PMB 5025, Awka Anambra State Nigeria
Opara Jude
Department of Statistics, Imo State University, PMB 2000, Owerri Nigeria
Mbachu Hope Ifeyinwa
Department of Statistics, Imo State University, PMB 2000, Owerri Nigeria
Iheagwara Andrew I.
Department of Planning, Research and Statistics, Ministry of Petroleum and Environment Owerri Imo State Nigeria