Abstract

An example is given of a method for establishing the confidence limits for the calibration of an electronic instrument utilized in measuring water activity. The method consists of the inverse use of a regression line with associated Working-Hotelling-Scheffe bounds for the true line and the construction of limits suitable for repeated use of the derived calibration. Interval estimates are given for the Kaymont-Rotronics Hydroskop DT, calibrated with vapor pressure manometer measurements of equilibrated salt solutions as standards. The statistical approach has general applicability and should be applied routinely for all calibration problems.

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