Much have been said in Section 2 on the significance of the arrangement of the population units on the precision Vy, while Cochran (1977, p. 208) [1] has given a corollary that the mean of asystematic sample will be more precise than that of SRS if and only if 22 , where wsy S is the weighted variance of all possible systematic samples as defined by relation (6) above and S is the variance of the population mean.
Notations