Source : Webster's Revised Unabridged Dictionary (1913)

Statistic \Sta*tis"tic\, Statistical \Sta*tis"tic*al\, a. [Cf.
   F. statistique.]
   Of or pertaining to statistics; as, statistical knowledge,
   statistical tabulation.

Source : WordNet®

statistical
     adj : of or relating to statistics; "statistical population"