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  2. List of unsolved problems in statistics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Though there are many approximate solutions (such as Welch's t-test), the problem continues to attract attention [4] as one of the classic problems in statistics. Multiple comparisons: There are various ways to adjust p-values to compensate for the simultaneous or sequential testing of hypotheses. Of particular interest is how to simultaneously ...

  3. Boy or girl paradox - Wikipedia

    en.wikipedia.org/wiki/Boy_or_Girl_paradox

    The Boy or Girl paradox surrounds a set of questions in probability theory, which are also known as The Two Child Problem, [1] Mr. Smith's Children [2] and the Mrs. Smith Problem. The initial formulation of the question dates back to at least 1959, when Martin Gardner featured it in his October 1959 " Mathematical Games column " in Scientific ...

  4. List of countries by median age - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    [2] [3] The median age of women tends to be much greater than that of men in some of the ex-Soviet republics, while in the Global South, the difference is far smaller or is reversed. In this article, two sets of data based on Central Intelligence Agency (CIA) and United Nations (UN) estimates are provided.

  5. Ages of Three Children puzzle - Wikipedia

    en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

    The problem can be presented in different ways, giving the same basic information: the product, that the sum is known, and that there is an oldest child (e.g. their ages adding up to today's date, [3] or the eldest being good at chess [4]).

  6. List of statistical tests - Wikipedia

    en.wikipedia.org/wiki/List_of_statistical_tests

    Statistical tests are used to test the fit between a hypothesis and the data. [1] [2] Choosing the right statistical test is not a trivial task. [1]The choice of the test depends on many properties of the research question.

  7. History of statistics - Wikipedia

    en.wikipedia.org/wiki/History_of_statistics

    The relation between statistics and probability theory developed rather late, however. In the 19th century, statistics increasingly used probability theory, whose initial results were found in the 17th and 18th centuries, particularly in the analysis of games of chance (gambling).

  8. What is ‘eldest daughter syndrome’? Expert shares 8 signs to ...

    www.aol.com/news/eldest-daughter-syndrome-expert...

    Cautioning that “eldest daughter syndrome” is not an official mental health diagnosis, Morton defined it as “the unique pressures and responsibilities placed onto the oldest daughter in the ...

  9. Systems of social stratification - Wikipedia

    en.wikipedia.org/wiki/Systems_of_social...

    The eldest brother is ideally a warrior who goes out with a group of followers drawn from his father's relatives and supporters and carves for himself a new domain; the youngest brother stays at home and inherits the ritual function of guardian of the shrine and, in the case of a chief, of the madai nat." Lineage rank was also determined by ...