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Sampling 4 pieces of precision-cut wire (to be used in computer assembley) every hour for the past 24 hours has produced the following results:
Hour x R Hour x R 1 3.25" .71" 13 3.11" .85" 2 3.10 1.18 14 2.83 1.31 3 3.22 1.43 15 3.12 1.06 4 3.39 1.26 16 2.84 .50 5 3.07 1.17 17 2.86 1.43 6 2.86 .32 18 2.74 1.29 7 3.05 .53 19 3.41 1.61 8 2.65 1.13 20 2.89 1.09 9 3.02 .71 21 2.65 1.08 10 2.85 1.33 22 3.28 .46 11 2.83 1.17 23 2.94 1.58 12 2.97 .40 24 2.64 .97
Develop appropriate control charts and determine whether there is any cause for concern n the cutting process. Plot the information and look for patterns.