Example Computing the Number of Defects

To calculate the maximum number of defects you can have out of a million opportunities and still have a six-sigma quality level process, follow these steps:

1. Select DOE > Design Diagnostics > Sample Size and Power.

2. Click the Sigma Quality Level button.

3. Leave Number of Defects blank.

4. Enter 1000000 as the Number of Opportunities.

5. Enter 6 as Sigma Quality Level.

6. Click Continue.

Figure 17.16 Six-Sigma Quality Level for 1,000,000 Opportunities 

The computation shows that the Number of Defects cannot be more than 3 in 1,000,000 opportunities to achieve a six-sigma quality level process.

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