statistics and probability

b) Eights pots, growing three barley plants each, were exposed to high tension discharge while nine similar pots were enclosed in an earthed wire cage. The number of tillers (shoots) in each pot was as follows:

Caged: 17, 27, 18, 25, 27, 29, 27, 23, 17.

Electrified: 16, 16, 20, 16, 21, 17, 15, 20.

Discuss whether electrification exercises any real effect on tillers.