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  2. Sample size determination - Wikipedia

    en.wikipedia.org/wiki/Sample_size_determination

    The table shown on the right can be used in a two-sample t-test to estimate the sample sizes of an experimental group and a control group that are of equal size, that is, the total number of individuals in the trial is twice that of the number given, and the desired significance level is 0.05. [4] The parameters used are:

  3. Size of groups, organizations, and communities - Wikipedia

    en.wikipedia.org/wiki/Size_of_groups...

    The number of possible person-to-person links (L) increases rapidly as the size of the group (N) increases (L = (N² - N) /2). In a four-member group there are six possible pairings; add a fifth member for each of the four to relate to and you have ten pairs. The number of possible two-person links in a group of twelve is 66.

  4. Member check - Wikipedia

    en.wikipedia.org/wiki/Member_check

    In qualitative research, a member check, also known as informant feedback or respondent validation, is a technique used by researchers to help improve the accuracy, credibility, validity, and transferability (also known as applicability, internal validity, [1] or fittingness) of a study. [2]

  5. Statistics - Wikipedia

    en.wikipedia.org/wiki/Statistics

    Planning the research, including finding the number of replicates of the study, using the following information: preliminary estimates regarding the size of treatment effects, alternative hypotheses, and the estimated experimental variability. Consideration of the selection of experimental subjects and the ethics of research is necessary.

  6. Participant observation - Wikipedia

    en.wikipedia.org/wiki/Participant_observation

    Researcher becomes a member of the group by fully embracing skills and customs for the sake of complete comprehension: This method permits the researcher to become more involved in the population. There is a risk of "going native" as the researcher strives for an in-depth understanding of the population studied. [9] [16] [17] Complete Participation

  7. Sampling (statistics) - Wikipedia

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

    A visual representation of the sampling process. In statistics, quality assurance, and survey methodology, sampling is the selection of a subset or a statistical sample (termed sample for short) of individuals from within a statistical population to estimate characteristics of the whole population.

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  9. Statistical hypothesis test - Wikipedia

    en.wikipedia.org/wiki/Statistical_hypothesis_test

    [48] [49] [50] In every year, the number of males born in London exceeded the number of females. Considering more male or more female births as equally likely, the probability of the observed outcome is 0.5 82 , or about 1 in 4,836,000,000,000,000,000,000,000; in modern terms, this is the p -value.