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

ASTM-E122 - 1997 EDITION - SUPERSEDED
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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)

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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Superseded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