1. Ahospital does tests for patients. Occasionally a test yieldsinconclusive results and must be repeated. Usingsamples of 100tests. 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 |
a. Ifthe true fraction defective for this process is unknown,using two sigma control limits, is the processin control?
b. Assuming a fraction defective of 2 percent, using3 sigmacontrol limits. Is the process incontrol?