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Answer by Henry for What uncited method is being used to test for lead water...
This is a bit of a rabbit hole. It seems that the $357$ is the answer to a completely different question. Its calculation comes from the sample size for an infinite population of $$\dfrac{1.96^2 \times...
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A couple of references I found:ASTM standardResearch Article with good referencesThe state of Colorado paper seems to parallel this one from MichiganIt references this group's work with this whitepaper
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What uncited method is being used to test for lead water pipes in the US?
Several states in the USA are using the same statistical procedure for verifying that water service lines don't contain lead, and I can't figure out what it's based on because no references are...
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