How many samples should you test for one product?

Say you want to only sell high quality/well manufactured products, how many samples is enough to be sure you have a good product? 3~5? Or is there no set amount? I believe China has improved their quality standards in the past few years, so most products might just be well manufactured. But I think that testing at least 2 samples is worthwhile. Any thoughts? If your answer is "depends on the product", please elaborate if you can. Thank you.

submitted by /u/ImInYourHair
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