Xbar and r chart3/26/2023 ![]() ![]() In other words, if the process is in statistical control, leave it alone. If adjustments are made to the centering on a process that is exhibiting common-cause variation, more variation will be generated than it would had the process just been left alone. The other value of using this chart is that if there is no assignable-cause variation, the process is to be left alone. The X-bar R Chart monitors the process across time and reveals assignable-cause variation, namely looking out for these two conditions as they arise. The process variation overlaps either the upper specification limit or the lower specification limit. Secondly, if the variation in the process is centered, but the variation in the process is too wide, no matter how the team tries to center the variation, a bad part will be produced. First, if the centering of the variation in a process gets too close to either the upper specification limit or the lower specification limit, a bad part will be produced, or the customer will be unhappy. Use: There are two ways to make a bad part or make for an unhappy customer. The X-bar R chart is a type of control chart that helps the team to visualize and monitor (and sometimes control) the behavior of the variation in a process. For more information, please view the lectures for both types of charts. ![]() This is the centerline of the X X control chart. ![]() This is the difference between the largest and smallest value in the sample. Some of the run rules are based on the concept of zones: Zone A Zone B Zone C Zone C Zone B Zone A The upper zones are obtained by splitting the distance between the center line and the upper limit by 3. Calculate the range of each set of samples. First, if the centering of the variation in a process gets too close to either the upper specification limit or the lower specification limit, a bad part will be produced, or the customer will be unhappy. To determine whether the process is in control, we apply run rules, FIRST to the R chart and then to the X-Bar chart. Six Sigma Terms X-bar R Chart There are two ways to make a bad part or make for an unhappy customer. ![]()
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