Question: PROBLEM 2: A quality control engineer has collected samples of wafers on 12 consecutive days. Each sample has three wafers. The diameters of the wafers

PROBLEM 2: A quality control engineer has collected samples of wafers on 12 consecutive days. Each sample has three wafers. The diameters of the wafers are given in the following Table. Calculate UCL and LCL for X-bar and R. Answer the following questions. sample number wafer 1 diameter wafer 2 diameter wafer 3 diameter 74 68 68 60 1 2 3 4 5 6 7 8 9 10 11 12 74 66 66 70 74 72 60 68 68 72 70 72 N88 70 74 64 66 66 62 56 70 58 58 64 64 Total 68 64 76 64 72 Total (c) 79.35 (d) 87.28 (c) 11.93 (d) 10.72 (6) What is the value of ? (a) 93.47 (b) 66.94 (7) What is the value of R? (a) 9.33 (b) 6.82 (8) What is the value of UCL(X)? (a) 76.46 (b) 89.72 (9) What is the value of LCLX)? (a) 46.23 (b) 69.81 (10) What is the value of UCL(R)? (a) 23.99 (b) 29.88 (11) What is the value of LCL(R)? (a) 6.83 (b) 2.71 (c) 90.23 (d) 60.87 (c) 71.92 (d) 57.42 (c) 16.31 (d) 30.79 (c) 0.00 (d) 3.92

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