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Variance of Sample Mean
For independent observations with variance σ²:
$$\operatorname{Var}(\overline X)=\frac{\sigma^2}{n}$$
Usage
- Used to determine how sampling variability decreases with sample size.
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Variance of Sample Mean
For independent observations with variance σ²:
$$\operatorname{Var}(\overline X)=\frac{\sigma^2}{n}$$
Usage
- Used to determine how sampling variability decreases with sample size.
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