In the formula $$\bar { X } \pm z _ { a/2 } ( \sigma / \sqrt { n } )$$ , the subscript $$\alpha / 2$$ refers to the area in the lower tail or upper tail of the sampling distribution of the sample mean.

Question

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The subscript $$\alpha / 2$$ refers to the area in the upper tail of the sampling distribution of the sample mean.

In the Formula Xˉ±za/2(σ/n)\bar { X } \pm z _ { a/2 } ( \sigma / \sqrt { n } )Xˉ±za/2​(σ/n​)

In the Formula $\bar { X } \pm z _ { a/2 } ( \sigma / \sqrt { n } )$