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. (6) What is the value of X ? (a) 93.47 (b) 66.94 (c) 79.35 (d) 87.28 (7) What is the value of R ? (a) 9.33 (b) 6.82 (c) 11.93 (d) 10.72 (8) What is the value of UCL(X) ? (a) 76.48 (b) 89.72 (c) 90.23 (d) 60.87 (9) What is the value of LCL(X) ? (a) 46.23 (b) 69.81 (c) 71.92 (d) 57,40 (10) What is the value of UCL(R)? (a) 24.02 (b) 29.88 (c) 16.31 (d) 30.79 (11) What is the value of LCL(R)? (a) 6.83 (b) 2.71 (c) 0.00 (d) 3.92
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