Question: Auto Fuel Efficiency . As part of a study designed to compare hybrid and similarly equipped conventional vehicles, Consumer Reports tested a variety of classes

Auto Fuel Efficiency. As part of a study designed to compare hybrid and similarly equipped conventional vehicles, Consumer Reports tested a variety of classes of hybrid and all-gas model cars and sport utility vehicles (SUVs). The following data show the miles-per-gallon rating Consumer Reports obtained for two hybrid small cars, two hybrid midsize cars, two hybrid small SUVs, and two hybrid midsize SUVs; also shown are the miles per gallon obtained for eight similarly equipped conventional models.

At the 0.05 level of significance, test for significant effects due to class, type, and interaction.

Make/Model

Class

Type

MPG

Honda Civic

Small Car

Hybrid

37

Honda Civic

Small Car

Conventional

28

Toyota Prius

Small Car

Hybrid

44

Toyota Corolla

Small Car

Conventional

32

Chevrolet Malibu

Midsize Car

Hybrid

27

Chevrolet Malibu

Midsize Car

Conventional

23

Nissan Altima

Midsize Car

Hybrid

32

Nissan Altima

Midsize Car

Conventional

25

Ford Escape

Small SUV

Hybrid

27

Ford Escape

Small SUV

Conventional

21

Saturn Vue

Small SUV

Hybrid

28

Saturn Vue

Small SUV

Conventional

22

Lexus RX

Midsize SUV

Hybrid

23

Lexus RX

Midsize SUV

Conventional

19

Toyota Highlander

Midsize SUV

Hybrid

24

Toyota Highlander

Midsize SUV

Conventional

18

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