Four overnight delivery services are tested for “gentleness” by shipping fragile items..

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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