There are 3 warning signals that a control chart uses to detect a process that may be out of control ...

There are 3 warning signals that a control chart uses to detect a process that may be out of control: 1) A point lies beyond 3 standard deviations of the mean. 2) There are 9 consecutive points that fall on one side of the mean. 3) At least two of three consecutive points lie more than two standard deviations from the mean. For each of these three signals, explain why that signal indicates that the process may be out of control.