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55 How sample size is determined
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The sample size for any study depends on the required precision; the size and nature of the population under study. Procedural aspects such as time, budget and resources available will dictate the size, as will publishing aspects, in terms of importance placed on the results by the audience. The main ways of deciding on sample size are: by calculation; by using accepted industry standards; by budget (time or money available); by building analysis cells. The calculation method takes account of the population size and the expected accuracy of results. In theory, this is the best way to arrive at a sample size; in practice, other methods are used. Many sample sizes for research studies are decided on the basis of what is feasible within time or money available. The sample size is often built up from the minimum numbers expected in each analysis cell. http://www.oxfordtextbooks.co.uk/orc/...
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