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From a process known to be in control, 6 samples of 4 units each were taken at random intervals and the units in the samples were weighed. The mean...

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Based on this sample and the control chart limits that you calculated in part (a), is the process in control? Why or Why not?

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From a process known to be in control. 6 samples of4 units each were taken at
random intervals and the units in the samples were weighed. The mean {Xbarl and range (R)
for each of the six samples are given in the following table. a. Calculate the 3-sigma Xbar—chart and R—chart control limits. b. Calculate the mean (Xbar) and range {R} for the following sample, which was taken from
the same process at a later time.

Top Answer

UCL x =  ​ ​ X ​ ¯ ​ ​ ​ ¯ ​ ​  + A 2 *  ​ R ​ ¯ ​ ​  LCL x =  ​ ​ X ​ ¯ ​... View the full answer

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