A Manager Wants to Build 3-Sigma X-Bar Control Limits for a Process

Multiple Choice

A manager wants to build 3-sigma x-bar control limits for a process. The target value for the mean of the process is 10 units, and the standard deviation of the process is 3. If samples of size 9 are to be taken, what will be the upper and lower control limits, respectively?

A) 19 and 1
B) 16 and 4
C) 13 and 7
D) 4 and 16
E) 7 and 13