From: Stan Hilliard
Date: 10/25/2004
Time: 3:43:12 PM
Tim,
I understand what you mean by defect rate of 0.05% (.0005 fraction defective) and 99.5% will work (0.005 fraction defective).
But I no not understand exactly what you mean by "99.5% confidence rating" and "1% precision level".
Your Question: "Is there anyway to achieve this same confidence on a lot size production of less than 329?"
My Answer: Since the lot size is less than the sample size, you would be doing 100% inspection, for which sampling error is zero and you can be 100% confident that 100% of the items will work, assuming that there is no inspection error.
Your Question: "Is there a way to calculate sampling size as a portion of lot size given confidence level and defect rate?"
My Answer: No. However, I have not been able to reproduce the n=329. Would you please show the calculation method that gave you the n=329?