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This is why a probability sample is needed; without a probability sample, the sampling distribution cannot be determined and an interval estimate of a parameter cannot be constructed.
This cross-sectional survey was designed as a multistage stratified, clustered probability sample, the sampling frame includes US residents ≥2 months of age, civilian, non-institutionalised population and NHANES III over sampled those >65 years, Non-Hispanic Blacks and Mexican Americans.
Depending on the application and on the sample, the sampling frequency could be set higher to reduce the amount of false peaks.
Due to the school-based nature of the sample the sampling scheme involved several elements to ensure a representative sample at both the primary and secondary school stages [ 23].
However, if there was a breach of the standard of 100 μg/L for total THMs (TTHMs) as a rolling 3-month average (or, where samples were too few, a maximum concentration > 100 μg/L in any one sample), the sampling frequency increased to a minimum of 12 or 24 per annum depending on the zone size.
In snowball sampling, the sample is affected by the network of relationships that exist.
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Sample: The sample consisted of 28 informants (patients, n = 16; family members, n = 12).
Sample: The sample included 1382 patients (691 men and 691 women) who were age-matched and EF-matched.
Based on the linear separability of the classifying sample, the sample is classified by the suitable classifier.
For the determination of E and (nu) of the rock sample, the sample was jacketed using heat shrink tubing.
With a containment ring that is mechanically stronger than the sample, the sample deforms under uniaxial load (Fig. 7).
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CEO of Professional Science Editing for Scientists @ prosciediting.com