ASTM E122-09
Historical Standard: ASTM E122-09 Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process
SUPERSEDED (see Active link, below)
ASTM E122
1. Scope
1.1 This practice covers simple methods for calculating how many units to include in a random sample in order to estimate with a specified precision, a measure of quality for all the units of a lot of material, or produced by a process. This practice will clearly indicate the sample size required to estimate the average value of some property or the fraction of nonconforming items produced by a production process during the time interval covered by the random sample. If the process is not in a state of statistical control, the result will not have predictive value for immediate (future) production. The practice treats the common situation where the sampling units can be considered to exhibit a single (overall) source of variability; it does not treat multi-level sources of variability.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
E456 Terminology Relating to Quality and Statistics
Keywords
Empirical knowledge; Error analysis; Maximum tolerable error; Process control; Sampling data analysis/statistics; Calculating test values; Size/size distribution analysis; Statistical methods;
ICS Code
ICS Number Code 03.120.30 (Application of statistical methods)
DOI: 10.1520/E0122-09
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