Question: 128 Statistical quality control often involves the use of control charts whose basic purpose is to A. Determine when accounting control procedures are not working. B. Control labor costs in production operations. C. Detect performance trends away from normal operations. Answer (C) is co r re ct. Statistical control charts are graphic aids for monitoring the status of any 1 subject to random variations. The chart consists of three horizontal lines p a horizontal time scale. The vertical scale represents the appropriate quant measure. The center line represents the average range or overall mean for process being controlled. The other two lines are the upper control limit a1 lower control limit. The processes are measured periodically, and the valu plotted on the chart. If the value falls within the control limits, no action i: the value falls outside the limits, the process is considered \"out of control, investigation is made for possible corrective action. Another advantage of is that it makes trends Visible. D. Monitor internal control applications of information technology