Which Expression Represents the Sum of the Squares of the Observations

Short Answer

Which expression represents the sum of the squares of the observations in a data set? A) $\sum x ^ { 2 }$

B) $\left( \sum x ^ { 2 } \right) ^ { 2 }$

C) $\sum { \sqrt { x } }$

D) $\sqrt { \sum { x } }$