Murthy (1967) [2] suggested that when N nk ≠ , i.e., the population units N cannot be divided into k clusters of equal size, therefore we choose the interval k to be the nearest integer to Nn resulting in n′ which may not necessarily be equal to n, the required sample size. He stated further that if N nk ≠ , if q and r′ were the quo-tient and remainder obtained respectively on dividing Nn, then, N can be written as N nq r′ = + and the sampling interval k can be taking as: