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In the Formula xˉ±zd2σ/n\bar { x } \pm z _ { d 2 } \sigma / \sqrt { n }

Question 124

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In the formula xˉ±zd2σ/n\bar { x } \pm z _ { d 2 } \sigma / \sqrt { n } , the subscript α/2\alpha / 2 refers to the area in the lower tail or upper tail of the sampling distribution of the sample mean.

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