Yes, STATISTICS is a Scrabble word!

Letter values in Scrabble US: S 1, T 1, A 1, T 1, I 1, S 1, T 1, I 1, C 3, S 1.

Is it a valid word?

STATISTICS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
a datum that can be represented numerically