The control limits for an np chart are how many standard deviations above and below the expected number of defectives?
A) one
B) two
C) three
D) four

Question

Quizplus · Accepted Answer

The control limits for an np chart are set three standard deviations above and below the expected number of defectives. This is a standard practice in statistical process control to ensure a balance between sensitivity to shifts in the process and avoiding false alarms.

The Control Limits for an Np Chart Are How Many