Suppose, After Developing the Control Chart, a Subgroup of Size

Multiple Choice

Suppose, after developing the control chart, a subgroup of size 4 yields a sample mean of 12.09 ounces and a range of 0.08. Which of the following statements is true?

A) The process is out of control on the x-bar chart but in control on the R chart.
B) The process is in control on the x-bar chart and in control on the R chart.
C) The process is out of control on the x-bar chart and out of control on the R chart.
D) The process is in control on the x-bar chart but out of control on the R chart.
E) The process is out of control on the R chart.