ASQ
CQE · Question #76
An X-bar and R chart with n=5 has been plotted for some time and has demonstrated random variation. Upon review of the last 30 plot points, the expected number of runs around the centerline on the…
The correct answer is D. 16. See the full explanation below for the reasoning.
Product and Process Control
Question
An X-bar and R chart with n=5 has been plotted for some time and has demonstrated random variation. Upon review of the last 30 plot points, the expected number of runs around the centerline on the X-bar chart is expected to be approximately which of the following?
Options
- A4
- B9
- C12
- D16
How the community answered
(44 responses)- A9% (4)
- B5% (2)
- C2% (1)
- D84% (37)
Topics
#X-bar chart#runs around centerline#control charts#statistical process control
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