Published: Jan 1959
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A physical interpretation may be applied to the statistical variances calculated from coal sampling data by relating one of them to a randomly mixed portion of the coal, and the other to a segregated portion. Use of general weightconsist relations makes it possible to extend this interpretation to sample reduction. The importance of assuring a sufficient degree of mixing in the gross sample is discussed and emphasized.
Assistant Technical Director, Battelle Memorial Institute, Columbus, Ohio