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Chapter 7. The Logic Of Sampling Key Terms. Nonprobability sampling Technique in which samples are selected in a way that is not suggested by probability theory.

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Chapter 7

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## Chapter 7

The Logic Of SamplingKey Terms

• Nonprobability samplingTechnique in which samples are selected in a way that is not suggested by probability theory.

• Purposive (judgmental) samplingSelecting a sample based on the knowledge of a population, it's elements and the purpose of the study.

• Snowball samplingResearcher collects data on members of the target population that can be located, then asks those individuals to provide the information to locate other members.

• Quota samplingUnits are selected into a sample on the basis of prespecified characteristics, so the total sample will have the same distribution of characteristics assumed to exist in the population being studied.

• Probability samplingSamples are selected in accord with probability theory, typically involving some random selection mechanism.

• RepresentativenessQuality of a sample having the same distribution of characteristics as the population from which it was selected.

• EPSEMEqual probability of selection method.

• ElementUnit about which information is collected and that provides the basis of analysis.

• PopulationThe theoretically specified aggregation of study elements.

• Study populationAggregation of elements from which the sample is actually selected.

• Random selectionEach element has an equal chance of selection independent of any other event in the selection process.

• Sampling unitElement or set of elements considered for selection in some stage of sampling.

• ParameterSummary description of a given variable in a population.

• StatisticSummary description of a variable in a sample.

• Sampling errorThe degree of error to be expected of a given sample design.

• Confidence levelExpression of the accuracy of sample statistics.

• Confidence intervalRange of values within which a population parameter is estimated to lie.

• Sampling frameList or quasi list of elements from which a probability sample is selected.

• Simple random samplingBasic sampling method assumed in the statistical computations of social research.

• Systematic samplingEvery kth element in the total list is chosen for inclusion in the sample.

• Sampling intervalStandard distance between elements selected in the sample.

• Sampling ratioProportion of elements in the population that are selected.

• StratificationGrouping of units composing a population into homogenous groups before sampling.

• Cluster samplingA multistage sampling in which natural groups are sampled initially with the members of each selected group being subsampled afterward.

• PPSProbability proportionate to size.

• WeightingGiving some cases more weight than others.