For statistical process control,a good sampling method should always:
A)use samples of random measurements over a long period of time.
B)minimize sampling cost.
C)maximize sample size.
D)use rational subgroups.

Question

Quizplus · Accepted Answer

Using rational subgroups is the best choice as it ensures that the samples are similar and representative of the process being monitored, allowing for accurate control limits to be set based on common cause variation. Random measurements over time (A) may not be representative of the process and could include special cause variation, and may be more costly than using rational subgroups. Minimizing sampling cost (B) and maximizing sample size (C) are important considerations but are secondary to using rational subgroups for accurate control limits.

For Statistical Process Control,a Good Sampling Method Should Always