The basis of any good piece of research is making sure you have sampled correctly and avoided bias. In this chapter the need for sampling is considered. The more commonly used methods of obtaining a sample in quantitative research are reviewed. The importance of a sample reflecting the population, and the various forms of bias that might arise because of study design with particular reference to health research, are discussed. Random and systematic errors and how they affect the data being collected are discussed. An overview of considerations are taken into account when looking at sample size and power is included. The concepts of reliability and validity are discussed along with common methods of establishing reliability and validity of measurement.
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