Sum of squares within samples is given by

A. $${\left( {{X_1} + X} \right)^2} + {\left( {{X_2} - X} \right)^2} + \,\,....$$

B. $${\left( {{X_1} - X} \right)^2} + {\left( {{X_2} - X} \right)^{2 + }} + \,\,....$$

C. $${\left( {{X_1} - \overline X } \right)^2} + {\left( {{X_2} - {{\overline{\overline X} }_2}} \right)^{2 + }} + \,\,....$$

D. $${\left( {{X_1} - {{\overline X }_1}} \right)^2} + {\left( {{X_2} - {{\overline X }_2}} \right)^2} + \,\,....$$

Answer: Option A