diff --git a/education/statistics/Correlation and Regression.md b/education/statistics/Correlation and Regression.md
index b0cc824..7dd9c34 100644
--- a/education/statistics/Correlation and Regression.md	
+++ b/education/statistics/Correlation and Regression.md	
@@ -110,7 +110,8 @@ The distance of an individual point from the regression line. This only applies
 - `residual = observed - predicted` for a given $x$ value 
 - The r.m.s error is the r.m.s size of the errors
 $$ \sqrt{1-r^2}(\sigma_y) $$
-
+- On a least squared regression line, the 1 r.m.s error away will contain $2\sigma$ of the data, and it should loosely mirror a normal curve. 
+- To approximate the R.M.S error for a scatter diagram, take a high value and a low value for a given $x$ coordinate, and divide by 4, because r.m.s error is within $2\sigma$ of either side of the line. 
 
 ---
 # Terminology