... step, is to decide on a sampling method, to do this one should outline the relevant population. There are different types of sampling that one can use, they range from simple random selection of the population units to highly complex samples, which can involve many stages of selection with stratification, and/or clustering the units into different groupings. Whether simple or complex, the typical characteristics of a properly designed sample are that all units in the target population have a known, nonzero chance of being included in the sample, and the sample design is outlined in adequate detail to allow fairly accurate calculation of sampling errors. It is these features that make it sufficiently valid to draw inferences from the sample results about the entire population, which the sample represents. The size of sample chosen for a survey should depend upon how accurate the final estimates are required to be. ...

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