k=2 and Other Sometimes Hidden Assumptions in Chemical Measurement Uncertainty Intervals | NIST

1 Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 208998390 USA 2 Analytical Technology, LGC Limited, Teddington, TW11 0LY, UK 3 Statistical Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8980 USA 4 School of Chemistry, University of New South Wales, Sydney, NSW 2052 Australia 5 Hemosaga Diagnostics Corp, 5931 Seacrest View Rd, San Diego, CA 92121-4355, USA 6 Department of Clinical Chemistry, Karolinska Hospital, Stockholm, SE-17176 Sweden david.duewer@nist.gov