12. Sample means and ranges were obtained for five samples of 10 units per sample from...
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12. Sample means and ranges were obtained for five samples of 10 units per sample from a production process. Assume the process was considered to be in control during the period these samples were collected. The results are as follows: 1 10.58 .23 29.97 .25 39.99 .21 4 10.23 .28 5 10.23 .28 LCL for the three sigma X chart for the process is approximately (for a sample size of 10, A2 = 0.31): A. 10.12. B. 10.05. C. 10.94. D. 9.44. E. 9.75. 12. Sample means and ranges were obtained for five samples of 10 units per sample from a production process. Assume the process was considered to be in control during the period these samples were collected. The results are as follows: 1 10.58 .23 29.97 .25 39.99 .21 4 10.23 .28 5 10.23 .28 LCL for the three sigma X chart for the process is approximately (for a sample size of 10, A2 = 0.31): A. 10.12. B. 10.05. C. 10.94. D. 9.44. E. 9.75.
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