diff --git a/education/statistics/Correlation and Regression.md b/education/statistics/Correlation and Regression.md
index d168be7..2b4cf58 100644
--- a/education/statistics/Correlation and Regression.md	
+++ b/education/statistics/Correlation and Regression.md	
@@ -8,14 +8,15 @@ If a scatter diagram is football shaped, it can be summarized using the 5-number
 
 | Variable | Description |
 | -- | -- |
-| $ave_x$ | The average of the set graphed along the X axis |
-| $SD_x$| The standard deviation of set graphed along the X axis |
-| $ave_y$ | The average of the set graphed along the Y axis | 
-| $SD_y$ | The standard deviation of the set graphed along the Y axis |
-| $r$ | The correlation coefficient, or how closely clustered the datapoints are in a line| 
+| $\mu_x$ | The average of the set graphed along the X axis |
+| $\sigma_x$| The standard deviation of set graphed along the X axis |
+| $\mu_y$ | The average of the set graphed along the Y axis | 
+| $\sigma_y$ | The standard deviation of the set graphed along the Y axis |
+| $r$ | The correlation coefficient, or how closely clustered the datapoints are in a line | 
 
-The intersection of the averages of x and y will be the center of an oval shaped scatter diagram. Draw lines 2SDs from the center along each axis to generalize the shape of a scatter plot
+The intersection of the averages of x and y will be the center of an oval shaped scatter diagram. Draw lines $2\sigma$ (will contain ~95% of all data) from the center along each axis to generalize the shape of a scatter plot.
 
+You can appr
 ### Association
 - Positive association is demonstrated when the dots are trend upward as $x$ increases ($r$ is positive). 
 - Negative association is demonstrated when the the dots trend downward as $x$ increases ($r$ is negative).