ISSN: 0090-3973
Page Count: 7

Variances in Sampling Streams of Coal

Rose, CD
President,Coal Technology Consultants, Inc., Subsidiary of Hoff and Associates, Inc.,AL,

Abstract

Beginning with the postulate that the serial correlation in an infinite population is invariant with respect to segment mass, expressions are developed for variance as a function of mass and expected variance of the mean using random, stratified random, or systematic sampling of a linear population. The expression for variance as a function of mass is shown to agree well with data from one coal experiment and to be the same as an empirical formula developed from agricultural experiments.

Keywords:
random sampling, stratified random sampling, systematic sampling, linear population, entropy, serial correlation, intraclass correlation, heterogeneity, anisotropy

Paper ID: JTE10690J
DOI: 10.1520/JTE10690J
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