Example of Tolerance Intervals

Suppose you want to estimate an interval that contains 90% of ozone level measurements.

1. Select Help > Sample Data Library and open Cities.jmp.

2. Select Analyze > Distribution.

3. Select OZONE and click Y, Columns.

4. Click OK.

5. Click the OZONE red triangle and select Tolerance Interval.

Figure 3.19 The Tolerance Intervals Window 

6. Keep the default selections, and click OK.

Figure 3.20 Example of a Tolerance Interval Report 

In this example, you can be 95% confident that at least 90% of the population lie between 0.057035 and 0.236715, based on the Lower TI (tolerance interval) and Upper TI values.

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