Brief introduction about Standard Deviation, Linear regression and titration. (include equations if possible)

standard deviation:
 https://www.dummies.com/education/math/statistics/why-standard-deviation-is-an-important-statistic/ 
 https://simple.wikipedia.org/wiki/Standard_deviation 

linear regression:
 https://www.chemicool.com/definition/linear_regression.html#:~:text=Linear%20regression%20uses%20the%20method,x%20and%20y%20data%20points.&text=The%20residuals%20must%20be%20squared,for%20a%20set%20of%20data. 
 https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Supplemental_Modules_(Analytical_Chemistry)/Data_Analysis/Method_of_Linear_Regression 

titration:
 https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Acids_and_Bases/Acid%2F%2FBase_Titrations