Question: a. Calculate the control limits for the and R charts in Figure 17.35. b. Is the process (using the redesigned coil) in statistical control? Explain.

a. Calculate the control limits for the and R charts in Figure 17.35.
b. Is the process (using the redesigned coil) in statistical control? Explain.
c. Calculate the natural tolerance limits for the process (using the redesigned coil).
d. Is the process (using the redesigned coil) capable of meeting specifications of 3.0 mm. to 6.0 mm.? Explain. Also find and interpret the sigma level capability.

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