Question: R chart may show trend when (a) a new batch of materials is used for the same process (b) the operator in charge of the

R chart may show trend when (a) a new batch of materials is used for the same process (b) the operator in charge of the process is changed to a new inexperienced operator (c) the skill of the operator in charge of the process gradually improves (d) all of the above (e)only (a) and (b)

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