By dividing the village of distribution groups within a particular village or villages, etc. in the middle and the end of the village, the village, and then select a sample with a sampling method the mistake.
Divided by the Housing dispersed within the village itself. Or split the middle of the village so the village and the village. Then select a sample with random sampling.
Divided by village groups dispersed within the village such as village or break, middle village and the end of the village Then the selected by random sampling coincidence .