From: Stan Hilliard
Date: 6/21/2005
Time: 10:28:22 AM
(1) "Have to test all 1250 ?"
The standard calls for testing all 1250.
(2) Is this 21 units per 100 , or is it 21 from the whole 1250?
It is 21 units per 1250
If your quality characteristic is a measured variable, you could consider using a variables plan with its OC curve matched to the attribute plan. The plan would offer equal protection/probabilities. For the n=1250, Ac=21 plan, the matched variables plans are:
n=437, k=2.12 (SD Unknown)
n=135, k=2.12 (SD known)
The newest version of TP105 (v3) will calculate the variables plans that match the producers and consumers points of any attribute plan.