Auto Pollution The accompanying table lists the amounts of greenhouse gases emitted by different cars in one year. (See Data Set 22 in Appendix B.) The Minitab display results from this table.

a. Assuming that there is no interaction effect, is there sufficient evidence to support the claim that amounts of emitted greenhouse gases are affected by the type of transmission (automatic manual)?

b. Assuming that there is no interaction effect, is there sufficient evidence to support the claim that amounts of emitted greenhouse gases are affected by the number of cylinders?

c. Based on the results from parts

(a) and (b), can we conclude that greenhouse gas emissions are not affected by the type of transmission or the number of cylinders?

Why or why not?

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630 CHAPTER 11 Analysis of Variance Major Math Business Liberal Arts Female 28 25 30 35 25 20 40 21 30 Male 25 30 20 30 24 25 25 20 32 Emission of Greenhouse Gases (tons year)

4 Cylinders 6 Cylinders 8 Cylinders Automatic 10 12 14 Manual 10 12 12