Englishfor English speakers
restricted
Adjective
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If something is restricted, it is limited.
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If something is restricted, it is available only to certain people.
You can't come in here! This is a restricted area!
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One of the levels of the secrecy of an official document.
sampling
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noun
(statistics) the selection of a suitable sample for study
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noun
measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form)
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noun
(= sample distribution)
items selected at random from a population and used to test hypotheses about the population