(Step-by-Step) At the 0.025 significance level, test the claim that the four brands have the same mean if the following sample results have been obtained. Brand
Question: At the 0.025 significance level, test the claim that the four brands have the same mean if the following sample results have been obtained.
| Brand A | Brand B | Brand C |
| 17 | 18 | 21 |
| 20 | 18 | 24 |
| 21 | 23 | 25 |
| 22 | 25 | 26 |
| 21 | 26 | 29 |
| 29 |
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