The following data on the deviation from target in the parallel orientation is taken from Table 1 of the article cited in Example 16.5. Sometimes a transformation of the data is appropriate, either because of nonnormality or because subgroup variation changes systematically with the subgroup mean. The authors of the cited article suggested a square root transformation for this data (the family of BoxCox transformations is
here; Minitab will identify the best value of λ). Transform the data as suggested, calculate control limits for X, R, and S charts, and check for the presence of any out-of-control signals.
![](https://test.transtutors.com/qimg/ee1d975e-97fb-4f78-85bc-bf002337a6ac.png)
Example 16.5
![](https://test.transtutors.com/qimg/efa9303e-723d-4c15-b9e2-6f56d2f16258.png)