Please answer the following True or False questions.

a$)$ When error values fall outside the limits of a control chart, this signals a need for corrective

action. $($True$/$False$)$

b$)$ When all errors plotted on a control chart are either all positive, or all negative, this shows

that the forecasting technique is performing adequately. $($True$/$False$)$

c$)$ A random pattern of errors within the limits of a control chart signals a need for corrective

action. $($True$/$False$)$