Data - Acceptance Sampling by
Attributes
main topic
This command allows you to create single attribute sampling plans or
to compare multiple attribute sampling plans; therefore, you will not
enter specific raw data into Minitab, but will enter information regarding
your process into the dialogs.
· AQL
and RQL
- represent specific points of interest on the OC curve. The consumer
and supplier should agree to the poorest level of quality that would be
acceptable as a process average (AQL) The consumer and supplier should
also agree to the poorest level of quality that the consumer will tolerate
in an individual lot (RQL)
· Sampling risk
- represents the probability of accepting a poor lot (consumer's risk)
and rejecting a good lot (producer's risk)
· Lot
size - represents the entire population of units that the sample will
be taken from. Lots should be homogeneous. They should be packaged and
shipped in sizes that are well-managed by both the consumer and supplier,
and in a way that allows easy selection of samples. It is usually more
economical to inspect larger lots rather than smaller lots.
Keep in mind that the units to be inspected should be selected randomly
and should be representative of all the items in the lot. This may require
extra effort such as numbering each item and drawing random numbers or
stratifying the lot and sampling from each strata or layer; however, this
process is necessary for the effectiveness of the sampling process.