Provide an Appropriate Response $E = z _ { \alpha / 2 } \cdot \frac { \sigma } { \sqrt { n } }$

question 31

Essay

Provide an appropriate response.
- $E = z _ { \alpha / 2 } \cdot \frac { \sigma } { \sqrt { n } }$ $\text { or } \mathrm { E } = \mathrm { t } _ { \alpha / 2 } \cdot \frac { \mathrm { s } } { \sqrt { \mathrm { n } } } ?$

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