SYMPOSIA PAPER Published: 01 January 1959

A Physical Interpretation of Coal Sampling Variances with Application to Sample Reduction


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.

Author Information

Landry, BA
Battelle Memorial Institute, Columbus, Ohio
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Developed by Committee: E11
Pages: 15–26
DOI: 10.1520/STP39487S
ISBN-EB: 978-0-8031-5656-2
ISBN-13: 978-0-8031-5655-5