NBS Monograph, Issue 163

20 C Nominal accepted values anvil block size Bureau of Standards calibrated sets CHECK STANDARD COMPARED TO ACCEPTED control blocks control set degrees of freedom difference Duplicate measurements F Test Federal found in Figure found in Table freedom associated gage block calibration Gage Block Sets Group S.D. group standard deviation intercomparison interferometer interferometric John Beers levels of measurement long blocks maintained by NBS Measurement Assurance Program measurement process Microinches at 20 monograph N₁ N₂ National Bureau National Engineering Laboratory National Standards NBS Gage Block NBS process NBS set NBS1 NBS2 Nominal Length out-of-control condition participating laboratory possible offset process control random error component repetitions REPORT OF TEST S.D. Degrees s.d. group S1 and S2 sections set of blocks standard blocks standard sets starting values statistically independent stylus systematic error temperature test blocks U₁ U₂ uncertainty statement V₁ VALUE OF CONTROL Values in Microinches variability