One-sided (Right-tailed) Confidence Intervals

The one-sided (right-tailed) $100\cdot(1-\alpha)\%$ confidence interval is centered at $\overline{x}$ and has its upper limit given by:

   upper limit$$\;=\;\overline{x}+z_{\alpha}\cdot\frac{\sigma}{\sqrt{n}}$$   Cell H14

The interval is assumed to have no lower limit, or, equivalently, to have an lower limit of $-\infty$ .