SOCY 210 Chapter Notes - Chapter 7: Nonprobability Sampling, Sample Size Determination, Systematic Sampling
25 Nov 2014
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Researchers have two motivations for using probability or. Qualitative researchers rarely draw a representative sample from a huge number of cases to intensely study the samples cases - which is the goal in quantitative research. Haphazard sampling can produce ineffective, highly unrepresentative samples and is not recommended: a type of sampling in which the researcher selects anyone he or she happens to come across, ex. Quota sampling is when the researcher first identifies general categories into which cases or people will be selected, then he or she selects a predetermined number of cases in each category: ex. Purposive sampling is used when an expert uses judgement in selecting cases with certain purpose in mind: appropriate in three situations: A researcher uses it to select unique cases that are especially informative. A researcher uses a popular magazine to study cultural themes because it is trend setting. A researcher may use purposive sampling to select members of a difficult-to-reach population.
