To test whether the mean amount of air pressure is same for air pumps produced by 3 manufacturers, a party consultant employs the three pumps to blow up 4 different balloons. The times needed to fill the balloons are below.
| Manufacturer A |
Manufacturer B |
Manufacturer C |
| 25 |
25 |
25 |
| 28 |
24 |
26 |
| 29 |
28 |
27 |
| 28 |
27 |
26 |
Employ the data to test whether the population means for the air pressure for pumps differ for the three manufacturers. Employ a = 0.10. Show all five steps of hypothesis testing process. Points will be deducted for missing parts; however, this might be done by using the calculator functions. (State which calculator menus were used.)