When exact numbers are used to express something that can not be described with exact numbers (e.g. 15% smarter) this is fake precision. When making calculations using data of a certain precision, one can’t claim a result with more significant figures than the original precision (this often happens with floating point math).
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It’s fairly common for companies to make sweeping claims in the course of day-to-day business. While this can be misleading, it is not particularly illegal. The “puffery doctrine” covers the line between unbridled optimism and misrepresentation.