quick one post the lot, the purchase month, the

test it again

does a bad result on one lot condemn the whole supplier

99 against a certificate of 99.4 is fine. the same supplier landing low four times in a row is a question

one data point

anyone tested the same lot twice at different labs

underfill is more common than impurity. if you only test purity you are testing the less likely failure

i told WWB about a result they would not have liked and they did not argue. credit where it is due

how do you separate batch variance from supplier variance

do you test every order or sample it

posting my Janoshik result on lot SG-1177, what do people make of it

how many lots do you need before you can say anything about a supplier

selection bias