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ASTM E122-07

Historical Revision

Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process

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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.


SDO ASTM: ASTM International
Document Number E122
Publication Date Oct. 1, 2007
Language en - English
Page Count 5
Revision Level 07
Supercedes
Committee E11.10
Publish Date Document Id Type View
April 1, 2017 E0122-17 Revision
Aug. 1, 2011 E0122-09E01 Revision
Aug. 1, 2009 E0122-09 Revision
Oct. 1, 2007 E0122-07 Revision
Oct. 10, 2000 E0122-99 Revision
Oct. 10, 2000 E0122-00 Revision
April 1, 2022 E0122-17R22 Reaffirmation