Tutorial: planning for data collection. Part III--Sample size.
There is no simple answer to the question, "how large a sample should I take?" Sample size depends on various data collection design details and on how we intend to use the data in future decision making. But with careful thought and some basic statistical knowledge, even nonstatisticians can determine the appropriate sample size for achieving useful results from data collection efforts.
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D003625:Data Collection / Q000379:methods / Q000706:statistics & numerical data*; D003657:Decision Making; D006302:Health Services Research / Q000379:methods / Q000592:standards*; D006801:Humans; D015233:Models, Statistical; D012494:Sampling Studies; D015983:Selection Bias; D014481:United States