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1. Sbh
   June 17th, 2009 - 1:32 pm

   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 control limits are 19.955cm and 20.045cm.
   The measurements made at the end of the process yielded the following results:

   20.033cm, 19.982cm, 19,995cm, 20.006cm, 19.970cm, 19.968cm, 19.963cm, 19.958cm, 19.962cm, 19.979cm, 19.959cm.

   What should be done?

   The process is under control. It should not be adjusted.
   A special cause should be investigated, the process should be adjusted.
   The control limits should be adjusted.
   The measuring equipment should be recalibrated.

   How is the calculation for this

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