Question: CIRCULAR PRODUCT PROBLEM: A Quality Analyst wants to construct a control chart to determine whether a machine producing a certain circular product was under control

CIRCULAR PRODUCT PROBLEM: A Quality Analyst wants to construct a control chart to determine whether a machine producing a certain circular product was under control with regards to its diameter. Accordingly, the Analyst sampled four products from the machine with the following diameter in millimeters. Which of the following are valid three sigma upper and lower control limits? Which of the following are valid three sigma upper and lower contral limits ? 22 and 18 23.5 and 16.5 23.29 and 16.71 23.16 and 16.84
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