TOPIC: Control Charts

A production process has been defined as part of an industrial equipment
manufacturing project.The process is intended to produce steel bolts with a
length of 20 cm.The acceptable control limits are 19.955 cm and 20.045 cm.
The measurements made at the end of the process yielded the following
results:
20.033 cm, 19.982 cm, 19,995 cm, 20.006 cm, 19.970 cm, 19.968 cm,
19.963 cm, 19.958 cm, 19.962 cm, 19.979 cm, 19.959 cm.
What should be done?
A. The process is under control.It should not be adjusted.
B. The process should be adjusted.
C. The control limits should be adjusted.
D. The measuring equipment should be recalibrated.

Please explain the answer...

hi umesh
you should adjust the process (
- because the process is not under control (A), you have a series of seven values
below mean
- If control limits were set right in the 1st place, they should not be adjusted.
- measuring equipment usually get recalibrated as part of regular maintenance

kind regards Werner

Umesh,

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This question was selected from ' www.oliverlehmann.com/pmp-self-test/75-free-questions.htm ' and the answer given is 'A special cause should be investigated, the process should be adjusted'