Confidence
Limits for Capability Index Cp
The confidence limits for
the Capability Index Cp may be calculated as follows:
where n is the subgroup size. This calculated value
may be added and subtracted from the calculated Cp index to indicate the
range of values for Cp expected from random samples of a stable process.
where n is the subgroup size.
This calculated value
may be added and subtracted from the calculated Cp index to indicate the
range of values for Cp expected from random samples of a stable process.