Sampling for a Quality Assurance Program
A sample is part of anything that is submitted for inspection or analysis that is representative of the whole population.
For the sample to be appropriate, it must be statically valid.
Validity is achieved by selecting the sample so as to ensure that each unit of material in a lot being sampled has an equal chance of being chosen for examination.
This process is called randomization.
A sample must be representative of the population to ensure integrity of results. A suggested sample number is the square root of the total number that would be sampled.
Representative samples are not only random samples, but must constitute a proportions amount of each part of the population.
For example, the sample must be identical with that of the gross material from which it was selected.
A major concern of quality assurance organization should be the collection, identification, and storage of a sufficient sample for inspection and analysis.
Sampling for a Quality Assurance Program
