Suppose That and R Charts Are Based on Subgroups $\pm$

question 31

Multiple Choice

Suppose that and R charts are based on subgroups of size four are being used to monitor the tire diameter size of a new radial tire manufactured by a tire company.The and R charts are found to be in statistical control with inches.A histogram of the tire diameter measurements indicates that distribution of these measurements is approximately normally distributed. If the tire diameter specifications are 50 inches $\pm$ 1 inch,is the process capable of meeting the specifications?

• A)Yes
• B)No

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