Practical Management Science
6th Edition
ISBN: 9781337406659
Author: WINSTON, Wayne L.
Publisher: Cengage,
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A sample of 1300 computer chips revealed that 62% of the chips fail in the first 1000 hours of their use. The company's promotional literature states that 63% of the chips fail in the first 1000 hours of their use. The
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- Twenty samples of 100 items each were inspected when a process was considered to be operating satisfactorily. In the 20 samples, a total of 140 items were found to be defective. (a) What is an estimate of the proportion defective when the process is in control? (b) What is the standard error of the proportion if samples of size 100 will be used for statistical process control? (Round your answer to four decimal places.) (c) Compute the upper and lower control limits for the control chart. (Round your answers to four decimal places.) UCL = LCL =arrow_forwardLinda Boardman, Inc., an equipment manufacturer in Boston, has submitted a sample cutoff valve to improve your manufacturing process. Your process engineering department has conducted experiments and found that the valve has a mean of 8.00 and a standard deviation of .04. Your desired performance is = 8.0 ± 30, where o = 0.047. Is the following statement true or false? Can Boardman produce the valve within the specified tolerance? (TRUE=yes, it can; FALSE=no, it cannot) O True O Falsearrow_forwardAs a mechanical engineer, the company you are working for assigned you for quality control. The manufacturing company produce 50,000 devices per day. Briefly explain: how will you determine equipment failures among manufactured devices? What sampling method will you apply to check the quality of the manufactured devices? Justifyarrow_forward
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