Yes, SAMPLE is a Scrabble word!

Letter values in Scrabble US: S 1, A 1, M 3, P 3, L 1, E 1.

Is it a valid word?

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

a small part of something intended as representative of the whole
items selected at random from a population and used to test hypotheses about the population
all or part of a natural object that is collected and preserved as an example of its class

Also: sample distribution, try out.