One-sided (Left-tailed) Confidence Intervals

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

   lower limit$$\;=\;\overline{x}-z_{\alpha}\cdot\frac{\sigma}{\sqrt{n}}\qquaD$$Cell E16

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