求翻译：When this benchmark is allowed to finish, it will have collected approximately one hundred and fifty (150) DNS performance samples from each nameserver being tested. Although this is sufficient to generate a good average performance estimate, if the collection of sampled values are too widely spread apart (in other words, not a lot of agreement among samples), it is impossible to know with "statistical certainty" (to be 95% sure) how individual nameservers compare to each other.是什么意思？

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