Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun A numerical piece of information.
 noun A calculated numerical value (such as the sample mean) that characterizes some aspect of a sample set of data, and that is often meant to estimate the true value of a corresponding parameter (such as the population mean) in an underlying population.
 noun One viewed solely as a piece of statistical or numerical information.
from The Century Dictionary.
 Statistical.
 noun Same as
statistics .  noun A statistical statement.
 noun A statistician.
from the GNU version of the Collaborative International Dictionary of English.
 adjective Of or pertaining to statistics.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective Alternative spelling of
statistical .  noun A single item in a
statistical study.  noun A
quantity calculated from thedata in asample , which characterises an important aspect in the sample (such asmean orstandard deviation ).  noun A person, or personal event, reduced to being an item of statistical information.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun a datum that can be represented numerically
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

Among medical doctors, the statistic is almost 75%.
Gang of Six Republicans say no to Baucus bill  for now 2009

JP: not to diminish your point but the statistic is actually “2/3 of corporations paid no income taxes for at least one year between 1996 and 2005.”
Early Word: Dems Name Warner as Keynote Speaker  The Caucus Blog  NYTimes.com 2008

That weaselly separation of the source from the statistic is the kind of things students do when they are are making stuff up, or at least playing fastandloose with the figures.
How Common is Plagiarism? Richard Nokes 2006

Also, as for the 13% of Americans not blaming Bush – I wonder what the statistic is among Southern states affected by the storm.

He wryly adds, The point of a GDP statistic is to drain away those sorts of problems.
Misleading Indicator 2009

This statistic is especially important because people are much more likely to develop liver cancer or cirrhosis if they are infected early in life, rather than later in life (most people are infected with hepatitis B virus when they are adolescents and young adults).
Hepatitis B Vaccine 2009

The medianhouseholdincome statistic is too blunt an instrument, because it includes households headed by 20yearolds (i.e., students) as well as 90yearolds (i.e., retirees).

This is a statistic from a poll that should send chills down the backs of not only Progressives, but their minions in the WH.

“My favorite statistic is that onequarter of the members of the National Academy of Sciences were born abroad,” I was told by Harold Varmus, the president of the Memorial SloanKettering Cancer Center and himself an academy member (and Nobel Prize winner).

The Census Bureau maintains this site, linking to each state's main statistic site.
PossibleUnderscore commented on the word statistic
42.7% or 47.3% or 65% or 68% or 83% or 87% 90% or 98% of statistics are made up on the spot.
July 19, 2009