Purposive and other non-random methods of sampling are the most common kinds of sampling approaches in observational studies.

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Non-random methods of sampling, such as purposive sampling, convenience sampling, and quota sampling, are often used in observational studies because they allow researchers to target specific groups or behaviors of interest. Random sampling is more common in experimental studies where the goal is to generalize the findings to a larger population.

Purposive and Other Non-Random Methods of Sampling Are the Most