Probability versus Nonprobability Sampling

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How to obtain a sample is a very important issue when designing a study. (Hair, Bush and Ortinau)

slbl3.gif (530 bytes) There are two major categories of sampling procedures.
  slbl3.gif (530 bytes) Probability sampling is an objective procedure in which the probability of selection is known in advance for each population unit. (Parasuraman, Grewal, Krishnan, 2004)
  slbl3.gif (530 bytes) Nonprobability sampling is a subjective procedure in which the probability of selection for each population is unknown beforehand. (Parasuraman, Grewal, Krishnan, 2004)
slbl3.gif (530 bytes) How the sample is selected has a profound impact on outcome.
       

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