ASQ
CQE · Question #81
An X-bar and R chart was prepared for an operation using twenty samples with five pieces in each sample; X-bar was found to be 33.6 and R-bar was 6.20. During production, a sample of five was taken…
The correct answer is D. Only the range was outside control limits. See the full explanation below for the reasoning.
Statistical Tools and Techniques
Question
An X-bar and R chart was prepared for an operation using twenty samples with five pieces in each sample; X-bar was found to be 33.6 and R-bar was 6.20. During production, a sample of five was taken and the pieces measured 36, 43, 37, 25, and 38. At the time, this sample was taken:
Options
- ABoth the average and range were within control limits.
- BNeither the average nor range were within control limits.
- COnly the average was outside control limits.
- DOnly the range was outside control limits.
How the community answered
(40 responses)- A3% (1)
- B5% (2)
- C13% (5)
- D80% (32)
Topics
#X-bar chart#R chart#control limits#SPC
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