Two sampling strategies are recommended for sampling Class 3 zones: a purely probabilistic sampling approach and a combined judgmental and random (probabilistic) approach (CJR).
However, because the two purely probabilistic sampling designs were applied to the entire 1st floor and the entire 2nd floor, the possible cleanliness of smaller areas on those floors could not be readily quantified with X %/Y % confidence statements.
Purely probabilistic sampling also identified contaminated areas.
of the adult population ([greater than or equal to] 18 years old) living in Brazil's 26 state capitals and Federal District was carried out in 2006 using the VIGITEL system.
Problems of sampling are again referred to in chapter 11, where it is stated that 'Qualitative approaches demand different sampling techniques from the randomly-selected and probabilistic sampling
which quantitative researchers use.
He indicated, "Moreover, the typical meta-analysis virtually never meets the condition of probabilistic sampling
of a population.
Usually, textbooks or papers about the research methodology would recommend probabilistic sampling
methods in order to reduce sampling bias or errors.
In the absence of a probabilistic sampling
, principles of statistics dictate that one should not generalize beyond the sample (Bernard, 1995, p.