To illustrate and verify results concerning the estimation
of the Systematic sample compared with other samples, we
consider data show the main annual food crops production of
the Sudan for 25 years since 1970/1971. These crops are sorghum, wheat and millet. Each of these is considered as a
separate population, so we have population 1 see table (4-1),
population 2, and population 3 for, sorghum, wheat and
millet respectively, and the total population size N =25 for
each population. For random and stratified sampling,
analysis of variance of the population into" between rows"
and "within rows" is desired. This is presented in tables (4-
2),(4-4) and (4-6).