dsandler.org/wp

I’m always running into abuses of precision in the service of weak
assertions. People are easily seduced into “rounding” numeric values in
their arguments, sometimes as much as half an order of magnitude, and
then rounding the resulting value again. They apply this rule
over and over to grossly exaggerate the figure. Recursive
aggrandizement!
Exemplar gratis:

“Our group has nearly 200 members. That’s practically 250, which
is basically 300, which is so close to the threshold of 350 that it’s
not even worth quibbling about!” [Hypothetical argument made to
gain special treatment, reserved for groups of 350, to a group of, say,
185.]

[Also note this related exchange
on bash.org.]