Denoting the standard deviations of these random variables by , there is theorem that tell us . This handy formula would not be correct if we used a different definition for "population standard deviation". So mathematicians are motivated to define "population standard deviation" the way it is ...
(Statistics)statisticsa normal distribution with mean zero and variance 1, with probability density function [exp(–x2)]/√2π Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014 ...
The meaning of STANDARD ERROR is the standard deviation of the probability function or probability density function of a random variable and especially of a statistic; specifically : the standard error of the mean of a sample from a population with a nor
At least four factors relate to the amount of damage done by man: accessibility, publicity, population density and standard of living. The particular ... LGA Smits - 《Conservation of Rock Art Proceedings of the International Workshop on the Conservation of Rock Art Perth September》 被引量: ...
1.A monetary standard under which the basic unit of currency is equal in value to and exchangeable for a specified amount of gold. 2.A model of excellence; a paragon:"Several generations of the laser have been widely available in Europe; the FDA approved the one now considered the gold st...
aWhich one of the following statements about population density is a correct one ? A.Population density refers to the spread of people over an area. B.Population density varies a result of difference in population size and area of land. 哪个以下声明关于人口密度是一正确一个? A.Population密度提...
Journal of Bone & Mineral MetabolismKaneko M, Miyake T, Yokoyama E et al (2000) Standard radial bone mineral density and physical factors in ordinary Japanese women. J Bone Miner Metab 18:31-35Kaneko M, Miyake T, Yokoyama E, Harano S, Toki T, Komine Y, et al. Standard radial bone ...
The Temporal Variability of Animal Abundances: Measures, Methods and Patterns measuring population variability =-=[17]-=-, was calculated for each willow stand by dividing the standard deviation of density with the mean density of... KJ Gaston,BH Mcardle - 《Philosophical Transactions of the Roya...
The loop-formation rate scales asdn/dt∝1/t4. So the earlier the formation time, the larger the number of loops and the resulting GW signal. This explains why the dominant population of loops emitting at timet~are the loops produced the earliest as possible, which corresponds toti=Gμt~....
− 16Standard Test Method forEdgewise Compressive Strength of SandwichConstructions 1This standard is issued under the f i xed designation C364/C364M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. ...