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ASTM-E122:2009 Edition

ASTM-E122:2009 Edition

$40.63

E122-09e1 Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process

Published By Publication Date Number of Pages
ASTM 2009 5
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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.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 Significance and Use
Empirical Knowledge Needed
Precision Desired
Equations for Calculating Sample Size
3 Reduction of Empirical Knowledge to a Numerical Value of
(Data for Previous Samples Available)
TABLE 1
4 Reduction of Empirical Knowledge to a Numerical Value for
(No Data from Previous Samples of the Same or Like Material Available)
Consideration of Cost for Sampling and Testing
FIG. 1
5 Selection of the Sample
FIG. 2

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