What Is the Formula for the Spearman's Correlation Coefficient?
A) $r _ { s } = 1 - \frac { N \left( \sum D \right) } { N \left( N ^ { 2 } - 1 \right) }$

Multiple Choice

What is the formula for the Spearman's correlation coefficient?

A) $r _ { s } = 1 - \frac { N \left( \sum D \right) } { N \left( N ^ { 2 } - 1 \right) }$
B) $r _ { s } = 1 - \frac { 6 \left( \sum D \right) } { N \left( N ^ { 2 } - 1 \right) }$
C) $r _ { s } = 1 - \frac { N \left( \sum D ^ { 2 } \right) } { N \left( N ^ { 2 } - 1 \right) }$
D) $r _ { s } = 1 - \frac { 6 \left( \sum D ^ { 2 } \right) } { N \left( N ^ { 2 } - 1 \right) }$