I do not have a strong statistics background and am hoping someone here can help.
For our smaller parts we stock and ship counts figured by weight. With some newly subcontracted parts there is quite the difference in count results. I've just taken 8 samples of 50 each - the low is 112.99g and the high is 116.52g. Depending on which sample I happened to grab I would get considerably different results. My 68kg box labeled 30,000 would either come up 91 pieces over or 821 pieces short.
How does one determine an appropriate sample size to ensure 99.7% accuracy? (+/- 3 sigma)
I know some of you quality geniuses will have this easily.
Why don't they ever ask me about Newton's Laws?

For our smaller parts we stock and ship counts figured by weight. With some newly subcontracted parts there is quite the difference in count results. I've just taken 8 samples of 50 each - the low is 112.99g and the high is 116.52g. Depending on which sample I happened to grab I would get considerably different results. My 68kg box labeled 30,000 would either come up 91 pieces over or 821 pieces short.
How does one determine an appropriate sample size to ensure 99.7% accuracy? (+/- 3 sigma)
I know some of you quality geniuses will have this easily.
Why don't they ever ask me about Newton's Laws?

Thank you!