\[\text { Under what circumstances can you replace } \sigma \text { with } s \text { in the formula } E = z _ { a / 2 } \cdot \frac { \sigma } { \sqrt { n } } ?\]

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Question 56

Question 56

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

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can be used in place...

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