A control chart is established with limits of \[\pm \,2\] standard errors for use in monitoring samples of size \[n=20.\] Assume the process to be in control. What is the likelihood of a sample mean falling outside the control limits?

A control chart is established with limits of \[\pm \,2\] standard err

1.	A control chart is established with limits of \[\pm \,2\] standard errors for use in monitoring samples of size \[n=20.\] Assume the process to be in control. What is the likelihood of a sample mean falling outside the control limits?
A.	97.7%
B.	0.953
C.	4.5%
D.	0.23
Answer» C. 4.5%

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A control chart is established with limits of \[\pm \,2\] standard errors for use in monitoring samples of size \[n=20.\] Assume the process to be in control. What is the likelihood of a sample mean falling outside the control limits?

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