Inspection sample size help
Inspection sample size help
(OP)
So I have a box with 2000 lets call them marbles. I need to determine how many marbles I need to sample to make sure i get at least one from each of 4 500 marble subsets. How would the number change if i only needed a 95% confidence interval for getting one from each subset.
Thoughts?
Thoughts?





RE: Inspection sample size help
RE: Inspection sample size help
Don't use this if you have a grade riding on it. I tried a couple of approaches and ended up using autofill in Excel.
However something feels funny about a couple of my assumptions.
Lunch is over so back to work.
Thanks for the entertainment.
Tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Inspection sample size help
RE: Inspection sample size help
Compositepro,
The more i've been thinking about it the closer I think you are. I was going down a similar path just from the other side of things but your solution seems correct.
Anyone else have any thoughts before we go forward?