Question 4 A finishing process packages assemblies into boxes. You have noticed variability in the boxes and desire to i

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Question 4 A Finishing Process Packages Assemblies Into Boxes You Have Noticed Variability In The Boxes And Desire To I 1 (53.65 KiB) Viewed 42 times

Question 4 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 loosely. Following are width measurements for the boxes. Note that the sample standard deviation of each sample is provided in the last column. Observations in each sample 1 2 3 4 5 6 7 8 9 S 68.51 68.94 68.66 68.49 68.64 68.34 68.99 68.92 68.62 0.2257 68.46 68.20 68.44 68.94 68.63 68.42 68.94 68.91 68.22 0.2966 68.54 68.56 68.55 68.56 68.62 68.99 68.95 68.97 68.71 0.1971 68.62 68.32 68.02 68.95 68.93 68.62 0.3037 68.34 68.54 68.77 68.46 68.70 68.70 68.69 68.94 68.93 68.70 68.64 68.56 68.24 68.47 68.97 68.95 68.46 0.2393 68.34 68.03 68.70 0.2902 68.46 i. Using the data in the table, compute the centre line, upper, and lower control limits for the appropriate control charts that monitor process deviation from the mean and its variation. ii. Is the process in control? iii. Does the process have special causes?