A cube has an edge length 9 cm. What is its volume? *

Well if the side of the cube = 9 cm the volume will likely be 9^3 = 729 cc

Randomly assigned group. the art class isn't random and only consists of a select type of people--it is not a representative sample; maybe more left handed people enjoy art than do right handed people! therefore, even though the randomly assigned group is smaller, it is the better estimate.