diff --git a/education/statistics/Sampling.md b/education/statistics/Sampling.md
index 6f872a6..449076c 100644
--- a/education/statistics/Sampling.md
+++ b/education/statistics/Sampling.md
@@ -66,3 +66,4 @@ $$ \frac{SD_{box}}{\sqrt{num_{draws}}} $$
 | ---- | ---- |
 | $EV_{ave}$ | The expected value for the average of the population |
 | $SE_{ave}$ | The standard error  |
+## Confidence Interval