In-Class For Sunday's Review Solutions

# In-Class For Sunday's Review Solutions - 6. A medical...

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6. A medical facility does MRIs for sports injuries. Occasionally a test yields inconclusive results and must be repeated. Using the following sample data and n = 200, determine the upper and lower control limits for the fraction of retests using two-sigma limits. Is the process in control? n = 200 Control Limits = Thus, UCL is .0234 and LCL becomes 0. Since n = 200, the fraction represented by each data point is half the amount shown. E.g., 1 defective = .005, 2 defectives = .01, etc. Sample 10 is too large. Omitting that value and recomputing limits with UCL = .0197 and LCL = 0. 7. The postmaster of a small western town receives a certain number of complaints each day about mail delivery. Determine three-sigma control limits using the following data. Is the process in control?

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Control limits: UCL is 16.266, LCL becomes 0. All values are within the limits. 3. Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges
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## This note was uploaded on 01/04/2010 for the course OPM 311 taught by Professor Rui during the Spring '08 term at Binghamton University.

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In-Class For Sunday's Review Solutions - 6. A medical...

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