Make/Model	Class	Hybrid	Conventional
Honda Civic	Small Car	44	28
Toyota Corolla/Prius	Small Car	50	32
Chevrolet Malibu	Midsize Car	27	23
Nissan Altima	Midsize Car	32	25
Ford Escape	Small SUV	27	21
Saturn Vue	Small SUV	28	22
Lexus RX	Midsize SUV	23	19
Toyota Highlander	Midsize SUV	24	18

A car dealership wants to see if there is a difference in fuel consumption between hybrid and conventional cars (type). The dealership is also interested in seeing if the class of the car (one of 4 classes) affects fuel consumption. Does class affect mpg? Does type affect mpg? Is there an interaction between class and type?