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A process producing TV tubes has an average yield of 90%, based on 30 samples. Samples taken for inspection have a size of 25.

a. Set up 2 sigma control limits for the mean proportion defective.

b. How can we obtain tighter control limits?

c. Suppose samples of size 100 are taken. What are the new control limits?

d. Three samples, each of size 100, are taken; the numbers defective are 8, 13, and 3. Is the process in control? What action, if any, should be taken?

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Operation Management, Management Studies

Category:- Operation Management
Reference No.:- M92592038

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