The quality of the research output and the validity of its findings depend upon the appropriateness of the sampling design selected for the study. The Choice of the sampling plan for calls for a careful consideration of various factors such as the nature of the problem, the intention of the researcher, the geographical are covered by the survey, the size of the population to be studied, the extent of the knowledge available about the population, the amount of funds and other facilities available for the study, the time factor and the desired precision or reliability of the results vis-à-vis the relative features and suitability of the various sampling techniques.