One-sided (Left-tailed) Confidence Intervals

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

   lower limit$$\;=\;\hat{p}-z_{\alpha}\cdot\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$$   Cell E19

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