This topic contains 4 replies, has 3 voices, and was last updated by Niraj Goyal 4 years ago.
I have an event probability of 0.004. This is the probability that a standard line product manufactured on any given day have a chance of 0.4 % of being defective. This was calculated by using the manufacture date of 9 defective units being found. We make lot sizes of 10 or 100 units in each lot and store in inventory. The question is, what is the probability of getting a defective unit if I take one unit out of inventory (could be from lot size 10 or 100)? How we calculate this probability.
According to me, confidence interval related stuff can help better in the situation.
The probability if you pick just one piece of a defective is .004 whatever the lot size. There is indifference the size of Lot you pick it from.
If the question was is the probability of finding a reject in 10 samples of a lot or 10 samples from a lot of 100 then Binomial would be used with p=.004 and 10 tries