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Nursing Research
Ch. 12
22
Nursing
Professional
06/17/2011

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Term
Sampling plan
Definition
specifies in advance how participants are to be selected and how many to include
Term
Population
Definition
the entire aggregation of cases in which a researcher is interested
Term
Eligibility criteria
Definition
specific characteristics that researchers use to delimit the study population
Term
Target population
Definition
the entire population in which a researcher is interested
Term
Accessible population
Definition
composed of cases from the target population that are accessible to the researcher as study participants
Term
Sampling
Definition
the process of selecting a portion of the population to represent the entire population
Term
Sample
Definition
a subset of population elements
Term
Representative sample
Definition
one whose main characteristics closely approximate those of the population
Term
Sampling bias
Definition
the systematic overrepresentation or underrepresentation of some segment of the population in terms of a characteristic relevant to the research question
Term
Strata
Definition
subpopulations (found in populations)
Term
Nonprobability sampling
Definition
researchers select elements by nonrandom methods
Term
Convenience sampling
Definition
entails using the most conveniently available poeple as participants
Term
Snowball sampling
Definition
a variant of convenience sampling; early sample members are asked to refer other people who meet the eligibility criteria
Term
Quota sampling
Definition
researchers identify population strata and determine how many participants are needed from each stratum
Term
Consecutive sampling
Definition
involves recruiting all of the people from an accessible population who meet the eligibility criteria over a specific time interval, or for a specific sample size
Term
Purposive sampling
Definition
based on the belief that researchers' knowledge about the population can be used to hand-pick sample members
Term
Probability sampling
Definition
involves the random selection of elements from a population
Term
Random selection
Definition
process in which each element in the population has an equal, independent chance of being selected
Term
Sampling frame
Definition
the technical name for the list of the population elements
Term
Statified random sampling
Definition
aim is to enhance representiveness; the population is first divided into two or more strata
Term
Cluster sampling
Definition
successive random sampling of units
Term
Multistage sampling
Definition
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