Table 511
Factors for Calculating Three-Sigma Limits for The The $\bar{x}$

Table 5.11
Factors for Calculating Three-Sigma Limits for the $\bar{x}$
Chart and R-Chart

Source: 1950 ASTM Manual on Quality Control of Materials, copyright American Society for Testing Materials. Reprinted with permission.
-Construct 3-sigma X-bar and R-charts using the data in the table. What conclusions can you draw about the state of control for this process?

A) X-bar chart is out of control but the R-chart is in control
B) the X-bar chart is out of control and the R-chart is also out of control
C) the X-bar chart and the R-chart are both in control
D) the X-bar chart is in control but the R-chart is out of control