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  2. Sampling error - Wikipedia

    en.wikipedia.org/wiki/Sampling_error

    Since the sample does not include all members of the population, statistics of the sample (often known as estimators), such as means and quartiles, generally differ from the statistics of the entire population (known as parameters).

  3. Survey sampling - Wikipedia

    en.wikipedia.org/wiki/Survey_sampling

    The purpose of sampling is to reduce the cost and/or the amount of work that it would take to survey the entire target population. A survey that measures the entire target population is called a census. A sample refers to a group or section of a population from which information is to be obtained. Survey samples can be broadly divided into two ...

  4. Sampling distribution - Wikipedia

    en.wikipedia.org/wiki/Sampling_distribution

    In statistics, a sampling distribution or finite-sample distribution is the probability distribution of a given random-sample-based statistic.If an arbitrarily large number of samples, each involving multiple observations (data points), were separately used in order to compute one value of a statistic (such as, for example, the sample mean or sample variance) for each sample, then the sampling ...

  5. Form I-130 - Wikipedia

    en.wikipedia.org/wiki/Form_I-130

    Form I-130, Petition for Alien Relative, 2015. Form I-130, Petition for Alien Relative is a form submitted to the United States Citizenship and Immigration Services (or, in the rare case of Direct Consular Filing, to a US consulate or embassy abroad) by a United States citizen or Lawful Permanent Resident petitioning for an immediate or close relative (who is not currently a United States ...

  6. Quadratic form (statistics) - Wikipedia

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

    In the setting where one has a set of observations and an operator matrix , then the residual sum of squares can be written as a quadratic form in : For procedures where the matrix is symmetric and idempotent, and the errors are Gaussian with covariance matrix , has a chi-squared distribution with degrees of freedom and noncentrality parameter ...

  7. LinkedIn - Wikipedia

    en.wikipedia.org/wiki/LinkedIn

    LinkedIn ( / lɪŋktˈɪn /) is a business and employment-focused social media platform that works through websites and mobile apps. It was launched on May 5, 2003 by Reid Hoffman and Eric Ly. [6] Since December 2016, LinkedIn has been a wholly owned subsidiary of Microsoft. [7] The platform is primarily used for professional networking and ...

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