Four overnight delivery services are tested for “gentleness” by shipping fragile items. The breakage rates observed are given below:
| A | 17 | 20 | 15 | 21 | 28 |
| B | 7 | 11 | 15 | 10 | 10 |
| C | 11 | 9 | 5 | 12 | 6 |
| D | 5 | 4 | 3 | 7 | 6 |
You immediately realize that the variance is not stable. Find an approximate 95% confidence interval for the transformation power using the Box-Cox method.
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