For Exercises 3 through 8, the null hypothesis was rejected. Use the Scheffe test when
3. Exercise 9 in Section 12-1.
9. Hybrid Vehicles A study was done before the recent surge in gasoline prices to compare the cost to drive 25 miles for different types of hybrid vehicles. The cost of a gallon of gas at the time of the study was approximately $2.50. Based on the information given for different models of hybrid cars, trucks, and SUVs, is there sufficient evidence to conclude a difference m the mean cost to drive 25 miles? Use a = 0.05. (The information in this exercise will be used in Exercise 3 in Section 12-2.)
Hybrid cars | Hybrid SUVs | Hybrid trucks |
2.10 | 2.10 | 3.62 |
2.70 | 2 42 | 3.43 |
1.67 | 2.25 | |
167 | 2.10 | |
1.30 | 2.25 |
Source: www.fueleconomy.com
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