Practice Quiz

Six Sigma Green Belt

Category - Black Belt

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Why must an R chart be constructed first before an X-bar chart preceded when monitoring a process mean?
  1. to make sure that the upper control limit is not surpassed
  2. to make sure that items in sub-groupings are random
  3. to make sure that the sample sizes are equal
  4. to make sure that the process is in control
Explanation
Answer: D - An R chart is constructed first before an X-bar by an R chart when monitoring a process mean to make sure that the process is in control.

Key Takeaway: An X-bar chart displays the means of consecutive samples that are drawn over time. This type of chart must be preceded by an R chart to make sure that the process is in control.
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