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
E456 Terminology Relating to Quality and Statistics
Index Terms
calculating test values; empirical knowledge; sampling; size; statistical methods; ICS Number Code 03.120.30
DOI: 10.1520/E0122-07
ASTM International is a member of CrossRef.
Citing ASTM Standards
[Back to Top]
