Why X bar and s chats are used together? The Xbar chart and the S chart are disp
ID: 3254899 • Letter: W
Question
Why X bar and s chats are used together? The Xbar chart and the S chart are displayed together because you should interpret both charts to determine whether your process is stable. Examine the S chart first because the process variation must be in control to correctly interpret the Xbar chart. The control limits of the Xbar chart are calculated considering both process spread and center. If the S chart is out of control, then the control limits on the Xbar chart may be inaccurate and may falsely indicate an out of control condition or fail to detect one. Q-Give me some examples of uses X bar-S chart?Explanation / Answer
In manufacturing industry, the tolerances for variation is often limited and x bar and s charts can be valuable in monitoring these processes, use Xbar-S charts to examine the process mean and variation for subgroups of part lengths.
Paint manufacturer wants to assess the stability of the process used to fill paint cans.
Use Xbar-S charts to examine the process mean and variation for hospital patients' blood pressure over time.
To examine the process mean and variation for call times
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