For Exercises 10–12, assume that the requirements for ANOVA have been met and test, using level of significance , whether the population means are equal.
10. Gas Mileage and Number of Cylinders. When it comes to getting good gas mileage, does the number of cylinders in your engine make a difference? The following table provides the summary statistics regarding miles per gallon for 4-cylinder, 6-cylinder, and 8-cylinder cars.
| 4 cylinders | 6 cylinders | 8 cylinders | |
|---|---|---|---|
| 199 | 83 | 103 | |
| 29.3 | 20.0 | 15.0 | |
| 5.7 | 3.8 | 2.9 |