Standard deviation - Wikipedia, the free encyclopedia
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In probability theory and statistics, the standard deviation of a statistical population, a data set, or a probability distribution is the square root of its variance. Standard deviation is a widely...
en.wikipedia.org/wiki/Standard_deviation
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A free java applet for calculating areas under the normal curve. ... This page contains calculators for the normal distribution. The first calculator allows to enter the mean, standard deviation, and cutoff points; the area under the normal distribution is computed. The second calculator does just the reverse.
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davidmlane.com/hyperstat/z_table.html
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The normal distribution: The school mathematics project; by Chris Belsom et al. ... Text; The Normal Curve, the Central Limit Theorem, and Markov's and Chebychev's inequalities for random variables; P. B. Stark; The normal curve, Central limit theorem, Normal approximation to binomial by H. J. Newton, J. H. Carroll, N.
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davidmlane.com/hyperstat/normal_distribution.html
davidmlane.com/hyperstat/normal_distribution.html
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The normal distribution curve is given by the function: ... We say that a random variable is distributed normally if its distribution looks like the normal curve, after shifting to get the correct mean and re-scaling (stretching or shrinking) to get the right standard deviation.
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www.math.umn.edu/~roberts/math3107/Normal_curve.html
www.math.umn.edu/~roberts/math3107/Normal_curve.html
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The Normal Distribution; (Bell Curve) ... The shape of the normal distribution resembles that of a bell, so it sometimes is referred to as the "bell curve", ... The above curve is for a data set having a mean of zero. In general, the normal distribution curve is described by the following probability density function:
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www.netmba.com/statistics/distribution/normal/
www.netmba.com/statistics/distribution/normal/
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The normal curve was developed mathematically in 1733 by DeMoivre as an approximation to the binomial distribution. His paper was not discovered until 1924 by Karl Pearson. Laplace used the normal curve in 1783 to describe the distribution of errors.
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www.stat.wvu.edu/SRS/Modules/Normal/normal.html
www.stat.wvu.edu/SRS/Modules/Normal/normal.html
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The exhibit below illustrates a simple process that gives rise to the familiar "bell curve" of the normal distribution. In this case balls are dropped from the top and pass through a series of pins until they hit the bottom.
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www.ms.uky.edu/~mai/java/stat/GaltonMachine.html
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One of the most widely used curves in statistice is the normal curve given by ; ... where μ is the population mean and σ is the population standard deviation. This tutorial is about exploring the properties such as shape and position of the graph of f as μ and σ are changed. ... normal distribution curve equation...
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www.analyzemath.com/statistics/graph_normal.html
www.analyzemath.com/statistics/graph_normal.html
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