Suppose That $\overline { \mathrm { X } }$ And R Charts Based on Subgroups of Size 4 Are

question 54

Multiple Choice

Suppose that $\overline { \mathrm { X } }$
And R charts based on subgroups of size 4 are being used to monitor the tire diameter.The $\overline { \mathrm { X } }$
And R charts are found to be in statistical control,with $\overline { \overline { X } } = 50.25 , \bar { R } = .8$

Inches.A histogram of the tire diameter measurements indicates that these measurements are approximately normally distributed.Find the sigma level capability of the process.

• A)1.93
• B)3.22
• C)0.64
• D)0.22

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