The number of observations in a population, the number of observations in a sample, and the procedure ... or a new product. Sampling distributions are used in statistics and research.

Businesses and organizations rely on it to make critical decisions, and it is particularly common in economic research. For example ... a well-chosen sample, there's a risk of sampling errors ...

Proprietary research is not exempted. Methodologically, in all or nearly all cases, ABC News requires a probability-based sample, with high levels of coverage of a credible sampling frame.