ASQ
CSSBB · Question #170
An x-bar and R chart is used to monitor a process. One week ago a new type of raw material was introduced and since that time 60 points have been plotted on the xbar chart and all are in the middle…
The correct answer is C. it is time to recalculate the control limits. See the full explanation below for the reasoning.
Control Phase
Question
An x-bar and R chart is used to monitor a process. One week ago a new type of raw material was introduced and since that time 60 points have been plotted on the xbar chart and all are in the middle third of the chart. The corresponding 60 points on the R chart are all below the average range. This indicates that:
Options
- Athe operator has been plotting the points incorrectly
- Bit is time to recalibrate the gage used
- Cit is time to recalculate the control limits
- Dthe material manager should be asked to go back to the previous raw material so the charts will
How the community answered
(34 responses)- A6% (2)
- B6% (2)
- C71% (24)
- D18% (6)
Topics
#x-bar chart#R chart#control limits#process improvement
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