Table $7.1$ Factors for Calculating Three- Sigma Limits for The $\overline { \bar { X } }$

Table $7.1$
Factors for Calculating Three- Sigma Limits for the $\overline { \bar { X } }$ - chart and $R$ -chart


-A milling operation has historically produced an average thickness of 0.005 inch with an average range of 0.0015 inch. Currently, the first three items from each batch of 20 are inspected. Use Table 1.. The quality control manager has recommended inspecting the first 3 and the last 3 items. (a sample of 6) from each batch of 20. What is the value of the

A) less than or equal to 0.0030
B) greater than 0.0030 but less than or equal to 0.0049
C) greater than 0.0049 but less than or equal to 0.0069
D) greater than 0.0069