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  2. Wikipedia:Identifying and using primary sources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Identifying_and...

    A variety of source types will be appropriate for most articles, and the type of source appropriate in one part of an article may be different from the type of source that is appropriate for a different part of the article. It is a third-party or independent source, with no significant financial or other conflict of interest.

  3. Survey (human research) - Wikipedia

    en.wikipedia.org/wiki/Survey_(human_research)

    A good sample selection is key as it allows one to generalize the findings from the sample to the population, which is the whole purpose of survey research. In addition to this, it is important to ensure that survey questions are not biased such as using suggestive words.

  4. Wikipedia : Identifying and using self-published works

    en.wikipedia.org/wiki/Wikipedia:Identifying_and...

    A self-published source can be independent, authoritative, high-quality, accurate, fact-checked, and expert-approved. Self-published sources can be reliable, and they can be used (but not for third-party claims about living people). Sometimes, a self-published source is even the best possible source or among the best sources. For example:

  5. Independent sources - Wikipedia

    en.wikipedia.org/wiki/Independent_sources

    The term "multiple independent sources" in journalism, criminal justice, science [1] and general research, [2] [3] refers to two or more unconnected people, organizations, entities or objects which provide a given set of information or samples. For example, two separate people who witness a traffic accident, first hand, could be considered ...

  6. Sampling (statistics) - Wikipedia

    en.wikipedia.org/wiki/Sampling_(statistics)

    A probability sample is a sample in which every unit in the population has a chance (greater than zero) of being selected in the sample, and this probability can be accurately determined. The combination of these traits makes it possible to produce unbiased estimates of population totals, by weighting sampled units according to their ...

  7. Survey sampling - Wikipedia

    en.wikipedia.org/wiki/Survey_sampling

    Quota Samples: The sample is designed to include a designated number of people with certain specified characteristics. For example, 100 coffee drinkers. This type of sampling is common in non-probability market research surveys. Convenience Samples: The sample is composed of whatever persons can be most easily accessed to fill out the survey.

  8. Wikipedia:Independent sources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Independent_sources

    Material available from sources that are self-published, primary sources, or biased because of a conflict of interest can play a role in writing an article, but it must be possible to source the information that establishes the subject's real-world notability to independent, third-party sources. Reliance on independent sources ensures that an ...

  9. Sample size determination - Wikipedia

    en.wikipedia.org/wiki/Sample_size_determination

    The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is usually determined based on the cost, time, or convenience of collecting the data, and the need for it to offer sufficient statistical power. In complex studies ...