ASTM-E122 › Historical Revision Information
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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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 prescribed 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.
Keywords
calculating test values; empirical knowledge; sampling; size; statistical methods; ICS Number Code 03.120.30 (Application of statistical methods)
To find similar documents by ASTM Volume:
14.01 (Healthcare Informatics)
To find similar documents by classification:
03.120.30 (Application of statistical methods)
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Document Number
ASTM-E122-97
Revision Level
1997 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
Dec. 10, 1997
Document Type
Practice
Page Count
6 pages
Committee Number
E11.10