4A hospital does tests for patients Occasionally a test yields inconclusive results and must be repeated Using samples of 100 tests It is been found the following (calculate to three decimal places) (6 marks) Sample 1 2 3 4 NO of retests 4 2 5 9 If the true fraction defective for this process is unknown, using two sigma control limits, is the process in control Assuming a fraction defective of 2 percent, using 3 sigma control limits Is the process in control

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Question: 4A hospital does tests for patients. Occasionally a test yields inconclusive results and must be repeated. Using samples of 100 tests. It is been found

4A hospital does tests for patients. Occasionally a test yields inconclusive results and must be repeated. Using samples of 100 tests. It is been found the following: (calculate to three decimal places) (6 marks)

Sample	1	2	3	4
NO. of retests	4	2	5	9

If the true fraction defective for this process is unknown, using two sigma control limits, is the process in control?

Assuming a fraction defective of 2 percent, using 3 sigma control limits. Is the process in control?

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