Is this process really out of statistical control? Is an investigation required? Or are these false positive signals? To answer these questions, it is helpful to review how the control limits should ...

Three sigma limits are used to set the upper and lower control limits in statistical quality control charts. Control charts establish limits for a manufacturing or business process that's in a ...

Control limits, how do they work? Is it a probability limit? Is it an economic limit? Read on to find out! A control chart consists ... s theorem provides statistical support for the +/- 3 sigma ...