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

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

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