NUMBER 8 A medical facile does MRIs for sports injuries. Occasionally a test yie
ID: 449523 • Letter: N
Question
NUMBER 8
A medical facile 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 end lower control limits for the fraction of retests using two-sigma limits. Is the process in control? 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? Given the following data for the number of defects per spool of cable, using three-sigma limits, is tne process in control? After a number of complaints about its directory assistance, a telephone company examined samples of calls to determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. Determine 95 percent limits. Is the process stable (i.e.. in control)? Explain.Explanation / Answer
UCL = c bar + 3 * (Sqrt(c bar)) = 1.5 + (3 * 1.225) = 5.18
LCL = c bar - 3 * (Sqrt(c bar)) = 1.5 - 3.675 = - 2.175
Since the defects lies within the control limit, the process is in control.
Observation No. of Defects 1 2 2 3 3 1 4 0 5 1 6 3 7 2 8 0 9 2 10 1 11 3 12 1 13 2 14 0 Sum 21 cbar = sum / n 1.5Related Questions
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