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Sampling
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Terms in this set (20)
population
entire group of individuals or units about which we want information
experiment
when a treatment is deliberately imposed on individuals in order to observe their responses
systematic
a type of probability sampling where the first individual or item is chosen at random with the rest of the sample is obtained by selecting every kth item from the entire frame
stratified
a type of probability sampling where the resulting sample has the same proportions as the population for important characteristics
infer
to generalise from statements about the sample to statements about the population
snowball
a type of non-probability sampling that asks respondents to refer additional respondents
placebo
an effect in an experiment where subjects respond differently after they receive a neutral treatment
census
the collection of data from all of the population
bias
when sample characteristics are different to those found in a population
convenience
a type of non-probability sampling where the selection of sampling units is left primarily to the interviewer
sampling frame
a list of all elements in the target population
sampling pool
individuals invited to participate in a survey
coverage errors
arise due to omission from the sampling frame of units belonging to the target population or to the inclusion of elements that do not belong there
simple random
a type of probability sampling in which each element has a known and equal probability of selection
purposeful
a type of non-probability sampling in which the interviewer chooses the sample to be representative, using professional judgment
quota
a type of non-probability sampling where the resulting sample has the same proportions as the population for important characteristics
sample error
the difference between the population parameter and the sample statistic
non-response bias
when sample characteristics are different to those found in a population due to systematic differences between those who completed the survey and those that did not
sample size
the number of subjects or elements included in a sample
observational study
when variables of interest are measured but there is no attempt to influence the responses
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