what was the mix of passing and failing units? 20 good units / 30 bad units
was teh true state of the unit (passing failing) known? Inspectors did not know anything about number of good vs bad. There is some interpretation but we tried to focus on truly bad and truly good vs borderline units.
what % were passing and failing were there marginal units? what proportion were marginal? There were about 10 margnal units out of the 50
was the mix of units close to the actual mix in production? in other words if the defect rate is actually 6% were there only 6% failing units in the study set? No the number of bad units was much higher for the study than what we would expect to find under normal production runs.
Did the inspection conditions mimic the actual inspection conditions?
same lighting? Samples were laid out in the lab for review under similar lighting conditions. Normally the steel would be moving though so not an exact relica of production. They would have had more time to look at the part and determine if it was good or bad.
same speed / time to inspect
Thanks for your help. We have plan to do more products as this was the first study. I want to make sure we understand what we are looking at and doing it correctly.