Source : Webster's Revised Unabridged Dictionary (1913)

Statistician \Stat`is*ti"cian\, n. [Cf. F. statisticien.]
   One versed in statistics; one who collects and classifies
   facts for statistics.

Source : WordNet®

statistician
     n 1: a mathematician who specializes in statistics [syn: {mathematical
          statistician}]
     2: someone versed in the collection and interpretation of
        numerical data (especially someone who uses statistics to
        calculate insurance premiums) [syn: {actuary}]