Question

Suppose that and R charts based on subgroups of size 4 are being used to monitor the tire diameter of a new radial tire. The and R charts are found to be in statistical control with = 50.25, = 8. inches. A histogram of the tire diameter measurements indicates that these measurements are approximately normally distributed. If the tire diameter specifications are 50 inches 1 inch, is the process capable of meeting the specifications?
A. Yes
B. No

Answer

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