Sampling four pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produc

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Sampling Four Pieces Of Precision Cut Wire To Be Used In Computer Assembly Every Hour For The Past 24 Hours Has Produc 1 (73.79 KiB) Viewed 122 times

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Sampling four pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results (in cm): R 0.71 1.18 1.43 Hour 1 2 3 4 5 6 7 8 X 3.25 3.10 3.22 3.39 3.07 2.86 3.05 2.65 Hour 9 10 11 12 13 14 15 1.26 X 3.02 2.85 2.83 2.97 3.11 2.83 3.12 2.84 R 0.71 1.33 1.17 0.40 0.85 1.31 1.06 0.50 Hour 17 18 19 20 21 22 23 24 X 2.86 2.74 3.41 2.89 2.65 3.28 2.94 2.64 R 1.43 1.29 1.61 1.09 1.08 0.46 1.58 0.97 1.17 0.32 0.53 1.13 16 a) Determine the upper and lower control limits for r-charts and R-charts. b) Draw the charts and plot the values of the sample means and ranges. c) Do the data indicate a process that is in control? d) Why or why not?