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

  1. A 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

  1. If the true fraction defective for this process is unknown, using two sigma control limits, is the process in control?
  1. Assuming a fraction defective of 2 percent, using 3 sigma control limits. Is the process in control?

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