Given the following process control data for a normally distributed quality variable (three samples of size four each):
If the process is known to have a mean of 15 and a standard deviation of 3,using three sigma control limits,do any of the sample means indicate an out-of-control process mean?

Question

Given the following process control data for a normally distributed quality variable (three samples of size four each):
  If the process is known to have a mean of 15 and a standard deviation of 3,using three sigma control limits,do any of the sample means indicate an out-of-control process mean?

Quizplus · Accepted Answer

The Answer of Given the following process control data for a normally distributed quality variable (three samples of size four each):
  If the process is known to have a mean of 15 and a standard deviation of 3,using three sigma control limits,do any of the sample means indicate an out-of-control process mean?

Given the Following Process Control Data for a Normally Distributed