AutoTrader

Multiple Choice

AutoTrader.com would like to test if a difference exists in the age of three different types of vehicles currently on the road: trucks, cars, and vans. The following data represent the age of a random sample of trucks, cars, and vans. The mean square for treatments MSTR for these observations is ________.

A) 2.0
B) 4.7
C) 16.0
D) 12.5