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Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is The parameter is the mean or expectation of the distribution (and also its median and mode ), while ...
Standard normal table. In statistics, a standard normal table, also called the unit normal table or Z table, [1] is a mathematical table for the values of Φ, the cumulative distribution function of the normal distribution. It is used to find the probability that a statistic is observed below, above, or between values on the standard normal ...
The National Center for Education Statistics (NCES) collects, analyzes and makes available data related to education in the U.S. and other nations. The National Center for Education Statistics (NCES) is the primary federal entity for collecting and analyzing education data in the United States and other nations.
Normality test. In statistics, normality tests are used to determine if a data set is well-modeled by a normal distribution and to compute how likely it is for a random variable underlying the data set to be normally distributed. More precisely, the tests are a form of model selection, and can be interpreted several ways, depending on one's ...
College Scorecard provides data that help prospective students and their advocates find the right fit for postsecondary education. College Scorecard’s consumer site allows users to search and compare colleges based on a highlighted set of data elements such as graduation rates, average annual cost, loan repayment rates, post-completion ...
Normal score. The term normal score is used with two different meanings in statistics. One of them relates to creating a single value which can be treated as if it had arisen from a standard normal distribution (zero mean, unit variance). The second one relates to assigning alternative values to data points within a dataset, with the broad ...
The National Center for Education Statistics (NCES) is the primary statistical agency of the U.S. Department of Education. It is one of thirteen principal federal statistical agencies 1 whose activities are predominantly focused on the collection, compilation, processing, or analysis of information for statistical purposes. NCES is located ...
The Nation’s Report Card is a resource—a common measure of student achievement—because it offers a window into the state of our K-12 education system and what our children are learning. When students, their parents, teachers, and principals participate in the Nation’s Report Card—the largest nationally representative and continuing ...