A manager wants to build 3-sigma x-bar control limits for a process.The target value for the mean of the process is 10 units,and the standard deviation of the process is 6.If samples of size 9 are to be taken,what will be the upper and lower control limits,respectively?
A)-8 and 28
B)16 and 4
C)12 and 8
D)4 and 16
E)8 and 12

Question

Quizplus · Accepted Answer

The control limits are calculated using the formula: Mean ± 3*(Standard Deviation/√n). Here, Mean = 10, Standard Deviation = 6, n = 9. So, the limits are 10 ± 3*(6/√9) = 10 ± 6, which gives 16 and 4.

A Manager Wants to Build 3-Sigma X-Bar Control Limits for a Process.The