The times (in minutes) to assemble a computer component for 3 different machines are listed in the table below. Workers are randomly selected.
| Machine 1 |
Machine 2 |
Machine 3 |
| 32 |
35 |
28 |
| 30 |
29 |
25 |
| 31 |
38 |
29 |
| 32 |
33 |
31 |
| 34 |
32 |
|
| 29 |
35 |
|
|
36 |
|
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Assuming all conditions are met, test the claim that there is a difference in mean assembly time for each machine using a 3% level of significance. Use the P-value approach.
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What provides visual support for your decision in part (a)? Explain.