Normality tests Main article: Normality tests Normality tests assess the likelihood that the given data set { x 1, …, x n } comes from a normal distribution. Typically the null hypothesis H 0 is that the observations are distributed normally with unspecified mean μ and varian ...
Properties Standardizing normal random variables As a consequence of property 1, it is possible to relate all normal random variables to the standard normal. For example if X is normal with mean μ and variance σ 2, then has mean zero and unit variance, that is Z has the sta ...
From Wikipedia, the free encyclopedia (Redirected from Gaussian distribution ) Jump to: navigation , search This article is about the univariate normal distribution. For normally distributed vectors, see Multivariate normal distribution . Probabi ...
复数 a 可以写成 u + v i的形式, u 为复数a的实部,简记为 u = Re(a) v 为复数a的虚部,简记为 v = Im(a) 例如,已知复数z = 1+2 i , 则 Re(z) = 1 Im(z) = 2 因此一个复数z 也可以写成 z = Re(z) + Im(z) i ---------------------- 我再说几句, (1) Re( ), Im( )可以视为复变函数 , 函数的自变量是 ...
Market segmentation is a concept in economics and marketing . A market segment is a sub-set of a market made up of people or organizations with one or more characteristics that cause them to demand similar product and/or services based on qualities of those products such as price or ...
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