Under what circumstances can you replace σ with s in the formula $E = z _ { \alpha / 2 } \cdot \frac { \sigma } { \sqrt { n } }$ ?

Name: Under what circumstances can you replace σ with s in the formula $E = z _ { \alpha / 2 } \cdot \frac { \sigma } { \sqrt { n } }$ ?
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The Answer of Under what circumstances can you replace σ with s in the formula $E = z _ { \alpha / 2 } \cdot \frac { \sigma } { \sqrt { n } }$ ?

Under What Circumstances Can You Replace σ with S in the Formula