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

Question

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

Quizplus · Accepted Answer

The sigma level capability of the process is given by:$$\sigma_{level}=\frac{\overline{X}}{R}=\frac{50.25}{0.8}=62.81$$The sigma level capability is 62.81, which is closest to 1.93.

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

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