Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results: Hour X R Hour X 1 3.35" 0.65" 7 2 3.20 1.23 8 R Hour 3.05" 0.58" 13 2.65 1.08 14 X 3 3.12 1.48 9 2.92 0.71 15 R Hour 3.11" 0.85" 19 2.93 1.26 20 3.02 1.11 X R 3.41" 1.66" 2.79 1.04 21 2.65 1.08 4 3.29 1.21 10 2.75 1.28 16 2.94 0.50 22 3.38 0.41 5 2.97 1.22 11 2.73 1.22 17 2.76 1.48 23 2.94 1.53 62.76 2.64 1.34 24 2.74 1.02 Based on the sampling done, the control limits for 3-sigma x chart are (round all intermediate calculations to three decimal places before proceeding with further calculations): 0.32 12 2.87 0.40 18