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95%

90%

85%

0%

10%

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100%

The Relationship between Confidence Interval Breadth and Confidence Level when the Observed Results are Nearer to 50% than to 0% or 100%

The charts below show the confidence intervals for the observed achievement rates on two different indicators in RI with the same number of facilities. The confidence intervals are much wider with an observed SQG achievement rate of 86% than with an observed SQG achievement rate of 100%.

95%

90%

85%

0%

10%

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90%

100%

Note: The above chart presents data collected from 22 facilities. The observed achievement rate is 100%.

9 5%

90%

8 5%

0%

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90%

100%

Note: The above chart presents data collected from 22 facilities. The observed achievement rate is 86%.

The States Common Measures Project Final Report

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