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+# 4.5 Statistical Analysis II
+[Introduction text]
+
+## Least Square Regression and Line of Best Fit
+### What is Linear Regression?
+Linear regression is one of the most fundamental techniques in data analysis. It models the relationship between two (or more) variables by fitting a **straight line** that best describes the trend in the data.
+
+Linear regression helps identify proportional relationships, estimate calibration constants, or model linear system responses.
+
+
+## Least square fitting
+
+
+## Extrapolation
+
+
+## Moving average