| cluster sampling | A method of sampling in which clusters of individuals are identified. Clusters are sampled, and then all individuals in each cluster are included in the sample.
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| confidence interval | An interval of values within which there is a given level of confidence (e.g., 95%) where the population value lies.
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| haphazard (convenience) sampling | Selecting subjects in a haphazard manner, usually on the basis of availability, and not with regard to having a representative sample of the population; a type of nonprobability sampling.
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| interviewer bias | Intentional or unintentional influence exerted by an interviewer in such a way that the actual or interpreted behavior of respondents is consistent with the interviewer's expectations.
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| nonprobability sampling | Type of sampling procedure in which one cannot specify the probability that any member of the population will be included in the sample.
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| panel study | In survey research, questioning the same people at two or more points in time.
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| population | The defined group of individuals from which a sample is drawn.
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| probability sampling | Type of sampling procedure in which one is able to specify the probability that any member of the population will be included in the sample.
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| purposive sample | A type of haphazard sample conducted to obtain pre-determined types of individuals for the sample.
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| response rate | The percentage of people selected for a sample who actually completed a survey.
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| response set | A pattern of individual response to questions on a self-report measure that is not related to the content of the questions.
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| sampling | The process of choosing members of a population to be included in a sample.
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| sampling frame | The individuals or clusters of individuals in a population who might actually be selected for inclusion in the sample.
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| simple random sampling | A sampling procedure in which each member of the population has an equal probability of being included in the sample.
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