[PS] fix: add small remark on confidence intervals

semester4/ps/ps-jh/parts/08_confidence-intervals/01_interval.tex

@@ -29,3 +29,5 @@ Konfidenzintervall ist $[\hat{\vartheta}_-, \hat{\vartheta}_+]$.
 	\left[ \overline{S}_n - \frac{z}{2 \sqrt{n}} \sqrt{\overline{S}_n (1 - \overline{S}_n)}, \overline{S}_n + \frac{z}{2 \sqrt{n}} \sqrt{\overline{S}_n (1 - \overline{S}_n)} \right]
 \]
 Alle Methoden liefern unterschiedliche Resultate
+
+\bi{Normalverteilung}: $\hat{\vartheta} = \overline{\cX}_n \pm z \frac{\sigma}{\sqrt{n}}$, $I = [\hat{\vartheta}_-, \hat{\vartheta}_+]$