Question: A finishing process packages assemblies into boxes. You have noticed variability in the boxes and desire to improve the process to fix the problem because

A finishing process packages assemblies into boxes. You have noticed variability in the boxes and desire to improve the process to fix the problem because some products fit too tightly into the boxes and others fit too closely. Following are width measurements of the box. Using x and R charts, plot and interpret the process.

 MEAN CI x-bar (Grand Mean) LCL x-bar (CI-A2*R-bar) UCL x-bar (CI+A2*R-bar) Sample Range (Max-Min) R-bar (Mean) UCL R (R-bar*D4) Spring 2020
1 68.51 68.46 68.54 68.34 68.46 68.46
2 68.94 68.2 68.54 68.56 68.7 68.7
3 68.66 68.44 68.55 68.77 68.7 68.64
4 68.49 68.94 68.56 68.62 68.69 68.56
5 68.64 68.63 68.62 68.32 68.34 68.24
6 68.34 68.42 68.99 68.02 68.03 68.47
7 68.99 68.94 68.95 68.95 68.94 68.97
8 68.92 68.91 68.97 68.93 68.96 68.95
GRAND MEAN
n=
A2=
D4=
info from chart

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