ASQ
CSSBB · Question #68
A set of data from a process has 8 readings per sample and 50 samples. The mean of the 50 sample means is 12.62. The mean of the 50 ranges is 0.18.A customer requires that SPC charts be done on…
The correct answer is A. 12.53 and 12.71. See the full explanation below for the reasoning.
Control Phase
Question
A set of data from a process has 8 readings per sample and 50 samples. The mean of the 50 sample means is 12.62. The mean of the 50 ranges is 0.18.A customer requires that SPC charts be done on their forms which have spaces for only 5 readings per sample. What should be the UCL and LCL for tbe new averages chart?
Options
- A12.53 and 12.71
- B12.58 and 12.66
- C11.61 and 13.63
- Dnone of the above
How the community answered
(22 responses)- A77% (17)
- B5% (1)
- C14% (3)
- D5% (1)
Topics
#X-bar chart#control limits#subgroup size change#SPC
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