12.2: Normal Critical Values for Confidence Levels
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| Confidence Level, C | Critical Value, \(Z_{c}\) |
|---|---|
| 99% | 2.575 |
| 98% | 2.33 |
| 95% | 1.96 |
| 90% | 1.645 |
| 80% | 1.28 |
Critical values for \(Z_{c}\) created using Microsoft Excel