The heating bills for a selected sample of houses using various forms of heating are given below (values are in dollars).
Gas Heated Homes | Central Electric | Heat Pump |
83 | 90 | 81 |
80 | 88 | 83 |
82 | 87 | 80 |
83 | 82 | 82 |
82 | 83 | 79 |
At α = 0.05, test to see if there is a significant difference among the average bills of the homes. Use both the critical and p-value approaches.