Question: For an injection molding process, a four-cavity mold is being used for a certain part. It has been proposed to develop X-bar and R charts

For an injection molding process, a four-cavity mold is being used for a certain part. It has been proposed to develop X-bar and R charts for part weight where the subgroup/sample is composed of the four parts from a single shot (i.e., one part from each cavity). Comment on the appropriateness of this method of sampling. What impact does it have on the ability of the charts to detect changes in the process?

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